I have a 6.2 from an '87 C10 that's getting swapped into my '87 K5 to replace the TBI 305. My K5 has the in-tank TBI pump, which is supposed to put out about 12-16psi. The 6.2 has what appears to be a mechanical lift pump on it (same place, same appearance as a gasser's mech. fuel pump). Anyone see any issues with leaving the TBI pump in the tank to feed the mechanical lift pump on the engine? I'm planning to leave the K5's stock fuel filter in place (in-line, in the pass. framerail) - any issues with this? I'm still gonna use the diesel-specific filter at the firewall (the rectangular-box-type from the donor truck) as well.