Yes, it will fit in the bed even the short box. bartamos gave you a proper answer but if you want to make a change the modern way to repower is a GM LS engine. They come in 4.8, 5.3, 6.0, 6.2 & 7.0 liter. Look for a wrecked 2wd pickup, "G" van, Camaro or Corvette and get the engine,transmission and all the fuel injection stuff. The modern engineering is far more superior.
