1978 318

pt70 said

Your truck weighs ~ 5,000 lbs. You need torque. You need cubic inches. Go with a 360 for now. [Remember the balance issue]. Then build a stroker motor from the 318. You'll be happy.

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I’ll agree with this. We’re dealing with a 3/4 ton truck, that was built to haul. A 318 just doesn’t have the grunt, and is probably a replacement engine anyway. For the price of the set of heads, you could probably source a good 5.9 Magnum engine from a salvage yard.

318’s are good engines and have their place, a 3/4 ton truck isn’t one of them.