I have often wondered how well a turbo from a 7.3 ford turbo diesel would work on a 250. Considering that the ford is 400 + ci in and turns a max of 3200 rpm. Full boost comes in at about 1/2 the rpm. The 250 is close to 1/2 the cubes and turns higher RPMs and would need less boost. It could be close.
The 5.9 Cummins is too small.
Those Chinese knock offs will probably give you the same life span as any other knock off.
A blow thru TBI will perform better but there are limitations to the boost pressures they can put up with before the injectors cant push fuel. Upping the pressure is normal but the TBI injectors have a pressure limit( I do not know what it is).
