Four barrel carburetor for slant 6 Offenhauser manifold?

The 4299 is off a 67 383 Auto Trans & has 1 7/16" pri.
#404 rods. This is a three step rod, 063/060/051. Should have domed piston covers, not flat.
0.089" Pri jets
# 368 sec jets which probably have a 0.068" orifice.

To free up the shaft. Heat alum with a gun around the shaft area. Dribble in some ATF while warm; gently try to move shaft, not excessive force, or you could twist the shaft.