Diesel or gas 4x4

[hopelessredneck]

so i have a 1978 gmc 3/4 ton long fleetside 2wd and i've always wanted a 4x4 so my brother found a 84 chevy 3/4 4x4 and it has a 6.5 diesel that might be blown might not be no one has checked if it is and im gunna be taking the front clip door and box off the 2wd and putting it on the 4x4 the question im asking is do u thing i shoud try and get the diesel running or rip it out and throw a gasser below is my 2wd