pilot bushing??

I just put my 318 motor together with a 65 forged crank from a 273. My problem now is that I installed a new brass pilot bushing and the tool to center the clutch doesn't fit the new bushing. I also bought one of those larger bushing/bearings that fit in the end of the crank where a torque converter goes, but the bushing/bearing wont fit in the hole in the end of the crank. What is up? It is a stock crank from a 65 273. I pulled the old bushing out 1st and it fit the tool. The new bushing only fit the input shaft of the trans up to a small step in the shaft diameter,abotu 1.5 to 2 inches but the bushing/bearing fit the shaft all the way to the splines of the shaft.
Is there more than 1 size of bushing for this? Does a 65 273 crank require a different size bushing than a 71 318 crank? How far is the bushing supposed to go on to the input shaft of the trans? Help....I am so ready to get this thing finished.
Dan