...and of course, the bell housing is "B-O-P" (Buick, Olds, Pontiac) bolt pattern, so a chev motor reqrs a chev tranny bell housing. I think BOP distributors rotate CCW while Chevs rotate CW too (correct me if I'm wrong on that one) so different distrib caps, firing order too I believe...basically, like previous posts said, completely different animals....not that you couldnt adapt a chev 350 to work, but by the time you mod everything (motor mounts are different too I think) you're prolly into it more than just finding the right Poncho motor... BTW, I have had awesome reliability from all the Poncho's (maybe 10-12?) I've owned over the years, mostly 400's, but only ever had one major mechanical failure (dropped a valve)