I know this can beat to death. lb7 with lly top end. I have my lly part.ecm, harness, heads injectors, fuel system blah blah. Only thing I'm not sure about. Can I use my cp3 from my lb7? Do I need the fuse box From an lly? My truck is an 03 with a zf6. It currently has an s363 with hps install kit. Reason I'm doing is because I have 3 bad injectors. Any tips you can give me would be good. I plan on starting it tuesday morning. Just waiting for head studs from merchant. Also i did a compression test before I ripped lb7 aprt. All cylinders were between 385-410. and #6 was at 360. Is that anything to worry about? Truck has 108k on it. I have the lly block too but it was in my Kodiak work truck and it's had a hard life.