Sent this post to a buddy of mine, this is what he said:"I'm not 100% sure cause the pic is grainy, but my best guess is the VW air cooled boxer. I was popular to chop rear ends off of VW bugs cause they were cheap as dirt & a dime a dozen. The engines were easy to rebuild & modify."Hope that helps!
Yo RFH! thank for the help! but I think we can write off the VW option because it seems to have 3 pipes sticking out of the right cil. head. Thus being a 6 cilinder!
My guess after looking around some, is a corvair. Looks very similar to the engine in Norm Grabowski's "six-pack".