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Either one will give you a boost in power. The 318 has smaller intake ports on the heads so the ports won't match up perfectly but it will give you a bit more power. Swapping in the 360 will definitely give you a lot more "seat of the pants" feel and it will pull loads around a lot easier...

No doubt. Considering the engines in all of it's predecessors, it could have easily ended up with an inline 6 cylinder, lol. Not sure if this was directed at me or not, but I'll toss my two cents in. If it were mine, I wouldn't have a problem swapping in a 360. It's still a small block and...

Economy and low cost. Keep in mind that this truck replaced the M715, which was a slow, underpowered dog just like 90% of the other military vehicles build before the 1980s. Besides, the 318 is plenty for a 3/4 ton truck that normally would not have been driven over 45 MPH.

Agreed. The only external differences between a 318 and 360 are the torque converter balance and the driver's side engine bracket. Everything else is generally the same or very similar and the transmission, exhaust, fuel lines, wiring, coolant hoses, and accessory brackets will all directly...

You may want to swap the throttle cable over also as the 4 BBL versions are a slightly different length. Similarly, make sure you leave the throttle brackets on the 360. You can make 2BBL stuff work, but if you have the stuff there to have it work correctly, I'd use it. :mrgreen:

You will need to leave the 360 engine mount brackets on the 360 and you will have to use a 360 torque converter or weld the 360 converter weights onto the 318 converter. Other than that, it's a bolt in deal.