Fuel Starvation?

Freiburger made 950 hp and ran 8.50s with a mechanical pump. A Holley 190lph if I remember right. You don’t necessarily “need” an electric pump, but you do need to make sure the pump you use is sufficient. You need to do some diagnostic work to figure it out. What goes away when the engine shuts off? It has to be fuel or spark and it’s on you to figure that out. Do a fuel flow test in to a bucket, rig a spark tester you can see while driving, rig a fuel pressure gauge you can see while driving. Those kind of things.