I have a 350 that is going in my 30 A model with a late 80's T-5 from an S10. The bell housing is, I think, a 62 or so chevy ( it has threaded holes for the top trans bolts and the bottom holes are not threaded). It also has the side mounts, but I'm not using them. And the bottom surface is flat to the floor when the dust pan is removed. My problem is that the trans will not pull up to the bell housing. I can easily slide the input shaft into the pilot bushing with out the clutch or pressure plate installed. I can easily put the trans and bell housing together when the clutch in not installed. When all parts are installed it stops abput 1/4 inch short of bolting up. I've tried to leave the pressure plate loose enough to help wiggle the parts together but it doesnt work. I've sanded ith inside of the pilot bushing for a few thousands of clearance. Same problem. What is the problem???????????