I have a 56 Bel-Air with a 265 powerglide.I want to put in a 350 with either a Turbo 350 or 400.I don't have a problem with the engine, but i'm unsure about the trans.Will the driveshaft need to be changed? length, yoke, etc. Also what if I keep the 265? Is either the 350 or 400 easier? Any help would be appreciated. Thanks.