yep c4 c5 will bolt up. I'm using stock 1350 t case no problems yet. the 1354 manual tcase is much better tcase, and will bolt up in the stock location.i bolted my motor, tranny together than laid the tranny in the stock tranny mount. then built my motor mounts to fit . no mods for drive shafts or tranny mounts that way. the 351w is just wider than the 302 the length is the same so it should all work.keep me posted I'm putting a hot rod 351w together for next winters project