Which one is better? (long)

I have experience with that concern, JDMOPAR. The 88-90 D series trucks is a low pressure system, approx 14.5 psi avg. Magnum is 45-50 psi, approx. The magnum fuel tank is different where the pump goes in the tank. Clamp vs screw top. So you will have to get a 91-93 tank or cut a top out of 1 and adapt it to your tank. I just switched tanks. The biggest problem is finding the 91-93 fuel pump plug for the wiring harness. It is not reproduced. But if you get a tank, just cut the plug back about 12 inches.