Oil Pump Leaks…

Then you're doin somethin wrong. My 64 Valiant has about a 3" narrower engine bay than yours and I can get my pump off by jacking the engine up off the k frame. It's tight, but it'll come out. You have even more room than I do.
Well, the Jack I have rn is small and doesn’t go up very high. My good one was last used by my brother and vanished one day without a trace. Along with my Jack stands… but anyway, the car comes up with the engine a little before the engine finally comes off, and that’s about where my tiny Jack reaches its limit