TBI 454 running rich

[Dustins8?]

Hi everyone.. first post here... I just bought an 87 1ton srw. has tbi 454 with th400 trans. as soon as I bought the truck it went on the trailer, home and into the garage. So I haven't driven it more than a test drive. Im in the process of taking off the 3 inch body and 6 inch suspension and just putting a 4 inch suspension on the truck. so while ive been waiting for springs I started going over the truck and giving it a tune up. pulled the plugs and almost every plug was black and even when the truck was running it just smelled extremely rich. so ive changed the plugs, wires, cap, rotor, distributer (bc the damn screws stripped for cap), coolant temp sensor on intake and the o2 sensor. Is there anything else you guys can think I should change or check? The motor was rebuilt back in 01 but only has about 30k on it. it also has an edelbrock rv cam in it and bored .30 over, stock intake and from everything else I can see it seems to be stock. thanks for any help