Don Terrill’s Speed-Talk

having a hard time getting pos caster on rt ft 1963 dodge b body all parts are new thanks in advance

Suggest you measure the mounts/frame dimensions. Being it's a "unibody, it may be tweaked. I had similar issue w/ my 6T5 hemi Belvedere.
We ended up pulling it back to specs, then adding frame ties and a cage. Luckily, we checked it B4 the cage was in!