I'm watching these little guys, look like a 16' boat with maybe a small block, good grief they accellerate!
/edit, went and looked it up, it was the International Group A (400) class I was watching...
"Single cast iron only, CID 412 cubic inch maximum, 368 cubic inches minimum. Maximum 2
valves per cylinder, push rod operated, with a maximum of 8 cylinders."
The kind of thing that keeps Speedy barking, but they say 23* for Chevy so I guess that says SBC, no LS?