I heard the original LT-1 fuel pump was the AC Delco EP 242 later upgraded to the higher peformance EP 376 then EP 381. All 3 are still available. What are the differences in output, reliability, etc.? (Delco won't say.) Which is the most reliable with the longest service life for a low RPM daily driver cruiser? I'm worried that a higher output pump might overwork the regulator into early failure.