head gasket failure or possibly IP?

[thatwilkersonboy]

when it all first started going down it started with a slight sparratic knock which we had assumed was fuel related like an injector not firing(idles smooth and quiet now). then we put injectors in it and cleaned the tanks and flushed the lines but my fuel pickups are rotted off. i was getting alot of air there for a little while but surely being this long now its not air. im not getting any at the filter anyways and the fuel lines to the injectors have been cracked and bled i dont know how many times now. i got the injectors at oreillys and theyre not the remans but im not real sure of them because thats what it acts like is a stuck injector. but still doesnt explain all the oil usage. good news though, i found a 90 250 4x4 for real cheap but theres been too much done too that truck for me to rob the motor and trash the rest. im 2wd 4sp and its auto and 4wd so if any of you guys are looking for something like that then ill jump on it and yall can buy w/out motor. id still like to fix mine if possible thats just a wore case. im buying the 3/4 ton anyways.

[thatwilkersonboy]

thats what i thought. but anyways bought a new motor today. used out of 92 250 column was gone so i dont know the mileage. but hey its cleaner than the old 6.9 thats in it right now i guess thats a start. lol also will be taking possesion of the other 250 earlier covered in this thread. but he cant get it started but i think i know what the problem is. either way it only costed $1000 and was rebuilt about 70,000 ago plus its got working four wheel drive. thanks for all of your help guys.