New Slant 6 put in the 64

We talked about the issue with the torque converter, he machines one, and then a couple days later I saw someone with the same issue and learned that you made them. So there is an adaptor in there.

These were definitely hydraulic lifters, and weren’t adjustable. They’re solid lifters now
Sounds like your mechanic/shop knows what they are doing. How about posting the contact info for them.