Really enjoy reading the post by 95GMC_sierra. It is very interesting. Have put my 454 suburban TBI to PFI Edelbrock conversion on the back burner. Right now concentrating on the 1995 Chevrolet C1500 pickup with 350 V8 to be swapped out for 350 Vortec with 454 throttle body. May just end up putting higher pressure capable in-tank fuel pump and use 94-95 TBI two original refurbished injectors. Then tune 16197427 ECU for this combination. Just need the appropriate TBI fuel regulator spring for the higher pressure.