That looks just like my cross member. Have you put a level on your carb to see if it's level? With 2 shims my carbs close to level and my trans is at 5.5*. I'm going to get a couple more shims today.
Went to the junk yard no shims.
Whats up with that. I had two sitting in my garage.
Also found a chevy 350 trans I did'nt even know I had.
Guess I'll make some.
-2 on the 64's rear end. I'm thinking thats as low as you can go with static stuff.