Early SBC with a 4L60E Question

[Machiatto]

I have a 1966 Buick Skylark that I just setup with an 1983 305 and a 4L60E. The engine is a two piece main, externally balanced crank. Originally with 200 automatic from a Camaro. The trans is from a 1996 C1500 with a 350. It has a one piece bell-housing and bolted right up - no issues there. I am using an EZ-TCU controller. All wired up and functional - no issues there. The issue I am having is the torque convertor wont slide up to the flex plate. The flex plate holes align, and the ring gear aligns with the starter so I don't think I need to move the flex-plate. I am thinking that the pin/nose at the front of the torque convertor is hitting the back of the crank - like it's too long or the crank is too shallow. There are a million adaptors out there but nothing that suggests that you can mate the this trans to this crank. Maybe I didn't do my homework well enough. I'm gonna pull the trans soon to see what's up but was wondering if anyone else has bumped into this and found a solution. For right now I created 3 .200" shims and bolted the convertor to the flex-plate and everything works and drives, but it's a hokey fix and I don't think it's a good idea as a permanent fix. Any insight would be appreciated.

Thanks -