Well upon further investigation, I found that the carb mounting pads were out of plane with each other in every possible way.
The front carb tilted down at the back at 1.5 degrees, the rear forward at .5 degrees, the front down at the flange side 1 degree and the back up at the flange side 1 degree. Also, the rear carb pad is at least 1/8" higher than the front (not due to the angles but from a horizontal line).
So, I decided to correct the manifold and not machine the adaptors to compensate making them totally useless for any other application. Plus, they would look funny.
I did happen to have two 3/4" plate adaptors to mount a 2 barrel Holley on a 4 barrel manifold. (No identification, but they look like some Moroso ones I have seen.) I drilled and countersunk the four holes to mount them sideways. Then decided to add 4 more to put them inline if I ever wanted to try it.
Now to mill the manifold and put a couple of matching carbs together and work out the linkage and.................
