360 V-8 with the factory auto. Can't remember the trans #. Inexpensive to either purchase new or rebuild a block. Same with trans. Difference between 318 and 360 cost, not worth discussing. Looking at the great condition of the truck, consider what your budget is. If budget is fat, 5.7 hemi, 45 trans. Either way, he will have a great truck. Will also need to replace the factory shackle bolts in the springs. Add a sway bar to rear. Look at Hellwig Visalia Ca. Add mechanical gauges for water, oil and trans temp. (factory idiot gauges) Mirrors can be replaced with some very nice aftermarket choices. Damn nice truck, well worth investing in. The forum would like updates as you go.