Oil pressure drops to 0

I have a schumacher kit to put a big block on a small block K frame - Is that what you are doing? The kit came with mounts that have a corner cut off Is that where your pump is hitting the mount?
I have a QA1 k frame and Trans Dapt mounts. The QA1 k frame is designed off of the factory V8 k frame. The trans dapt mount is a “cut it yourself” thing. And I never cut it so yes that’s where it’s hitting.