I guess it will depend on how good or bad an adapter is designed to allow for using a mechanical pump. If you want to retain a mechanical pump, you cannot use the style adapter Tom offers.
That's what I was thinking when I looked at the fuel pump placement on the 292. The truck 292 engine swaps the pump and motor mount around, which is why the cam is different. But the mount blocks the pump from being installed. Extra cost to the 292 swap.
