Fuel pressure problem..I'm at a loss.

It is possible, With the right pump. On the engine masters show Freiburger just made over 1000 hp on a BBC with a tunnel ram and two 4s naturally aspirated, all fed by a mechanical pump.
Freidburger is great I like that show, but, pulling the snot out of an engine on a dyno is not even close to getting it to work on the road.