According the Jegs description, this motor is not mechanical fuel pump capable. Also its a used block and crank which is not the worst thing in the world but I'd prefer GM factory new since its an option.Here it is for $1400 less (2-bolt mains)... probably same rebuild shop (ATK), probably same warranty. When I was shopping-around for a crate 5.3L, I found they all came from ATK or sister shop in Mexico no matter who the retailer.
JEGS Performance Products 1996-2000 Chevy Truck Vortec 350ci 5.7L Crate Engine - JEGS
JEGS crate engines are reverse engineered to create a product that has better than new quality. Reverse engineering allows any factory original defect to be found and removed; saving you time and money by keeping your vehicle out of the shop and on the road. Engines are factory checked after...www.jegs.com
I'm doing research on electric fuel pumps. There has to be a simple solution I'm sure I'm not the first person to ask this question. Holley has an electric pump that is claimed to be a direct replacement for a mechanical pump. Sounds like its on my level.