FMX---When I built my 31 desoto coupe, I used a factory stock 327 in it, with a 3 speed factory stock automatic tranny (probably a turbo 350) and a rearend from a 66 Mustang. The body was all steel. When I built the 27 roadster, I used a 350 four bolt main block, an aftermarket "hot" hydraulic camshaft, turbo 350 with shift kit, and a set of 3:55 rearend gears. The body was glass and aluminum. The stock 327 had a lot more snot than the modified 350. I'm not sure that would be a typical scenario, but thats the way I found it.---Brian