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Before: you can see where the port is supposed to be located
After: with a hole cut to accommodate the pickup.
The stock gasket has a much larger center hole.
It was Milodon, I discovered it the hard way a couple years ago. They put the gasket for an external pickup in the standard kit. It was painfully obvious when I took the pump back off. I cut the gasket around the pickup port and reinstalled it and the pump. After spinning the pump a few...
Do you know the bore size of the master cylinder? The smaller the bore, the more travel it requires to displace the same amount of fluid. I think B-Body power disc brake master cylinder bores are around 1" - 1.125". How far is the pedal from the floor to start with? Is the brake booster pushrod...
If you’re running a divorced choke, blocking the crossover could be a problem. With an electric choke or no choke at all, I don’t see a problem. I have no choke and a blocked crossover, cold idle is a little erratic but drivability improves and the idle is fine within a couple blocks.
The Holley throttle adapter will move the stud higher which resin a longer arc of travel, I wouldn’t attempt to make any further adjustments until the adapter is installed.