Im about to buy a new one. I have a Holley mechanical. Its an 80 gph pump. Never had a problem with it till i put the new intake and carb on. Their is a new fuel pump made for the Olds, its a 110 gph pump, suppose to be real good according to the guys on the Olds boards.
The fuel pressure does drop when im at wot, i can watch the gauge drop from 7-3psi. What i don't know is at what rpm the pressure starts to fall at.