The problem with the BB Pontiac is the FIT, on my '53 the small
block is a tight fit as it is (had to move the stearing column &
refit it with a different / thinner shaft). The mounts will be different, besides there are a few shops (see Chevy Duty & Brothers) that make motor mounts (about $55) for
SB Chevy's that save a lot of hassle / work !
The Pontiac engines used were for the "2nd series" trucks on GMC's 1955+ etc. & that is a different eng. bay
...entirely !!! 2nd, I used a 400 Turbo tranny & had no real fit
problems with the floor other than an opening for the
Lokar shifter & again, CD & Brothers offer a tranny mount for
the 350 & 400 tranny's (about $45 + $15 for 2 pads) !
Hope this info helps, if you are going to modify that rather
rare 1954, do it right, don't cut corners (such as using the S10
sub frame etc...), you will be happier in the end with the results !
