PROBLEM SOLVED. I installed a Carter in-line fuel pump rated at 75gph. and 45psi. I wired this pump thru a new circuit from the starting battery using a new 30 amp cube relay with the circuit fused @ 15 amps to prevent overloading the original circuits in the fuel system. The coil of this relay is activated thru the same negative signal as the original fuel pump relay and the inertia switch shuts the fuel supply down as desired. The rig now starts normally and full power is restored. Fuel pressure with key on, key off holds @ 40psi and 35psi while running. Throttle has no hesitation and again, full power is restored. Now it's a good cleaning inside and out and we're ready to roll.
Thank you again for all your help with this issue and HAPPY CAMPING TO ALL.