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350s use the same intake as 455s and 400s, but you only want 65 and later manifolds, the flange angle is different on the early engines. So you don't need a specific one. The Edelbrock performer works almost as good as the stock one, and it's lighter so it's an option. Swapping to a chevy means you have to change everything, wiring is different because the starter and alternator are on the opposite side of a chevy. Fuel lines are drivers side on Pontiac passenger side on chevy, the transmission case will need to be changed, the mounts are different, radiator is different, brackets won't interchange, so you need a ton of stuff to do the swap. Its a hell of alot cheaper and easier to find a 400 and build it, plus you'll get more power without resorting to aftermarket heads. Go to a chevy if you want, but it will cost more and you'll go slower for the same money, particularly if you do a crate 350.
Everything between a 350 and 400 interchanges except the pistons and rings, other than the bore size they're essentially the same engine. The 455 is only slightly different, bore and main journal size are different, they have a 0.030 larger bore than a 400, but a big 4.21" stroke. You can build a large cube Pontiac for around $4000 if you spend money where it matters, I did a 455 with heavily ported heads and a hydraulic roller cam for $4200, and that included a 4.25" crank kit from Butler. That thing is 550hp and 600ftlbs (under 6000rpm no less) all day running E85. You're not going to build a chevy comparable to it for that little.
Right now, headers and a 4 barrel intake is all you need. No need for an ignition change other than to recurve the advance so it comes in faster and is full advance before 3000rpm. The HEI works great, I've run them for years.
Don't worry about the rear end, it's an 8.5 10 bolt, it's takes more power than you're going to build to break one. Finding a posi is easy and relatively inexpensive, they're not the weak pos 7.5" ten bolt that the 82-02 F bodys had.
Oh and Bob, the 301 showed up in 77, if an earlier car had one, it wasn't born with it. Easy way to spot one of them 301s is the dipstick is behind the drivers side head, all other Pontiac V8 engines have it passenger side between #2 and #4 cylinders.
Everything between a 350 and 400 interchanges except the pistons and rings, other than the bore size they're essentially the same engine. The 455 is only slightly different, bore and main journal size are different, they have a 0.030 larger bore than a 400, but a big 4.21" stroke. You can build a large cube Pontiac for around $4000 if you spend money where it matters, I did a 455 with heavily ported heads and a hydraulic roller cam for $4200, and that included a 4.25" crank kit from Butler. That thing is 550hp and 600ftlbs (under 6000rpm no less) all day running E85. You're not going to build a chevy comparable to it for that little.
Right now, headers and a 4 barrel intake is all you need. No need for an ignition change other than to recurve the advance so it comes in faster and is full advance before 3000rpm. The HEI works great, I've run them for years.
Don't worry about the rear end, it's an 8.5 10 bolt, it's takes more power than you're going to build to break one. Finding a posi is easy and relatively inexpensive, they're not the weak pos 7.5" ten bolt that the 82-02 F bodys had.
Oh and Bob, the 301 showed up in 77, if an earlier car had one, it wasn't born with it. Easy way to spot one of them 301s is the dipstick is behind the drivers side head, all other Pontiac V8 engines have it passenger side between #2 and #4 cylinders.
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