318 Torque Build

With the pistons.080 down hole, I would probably look at a set of sealed power four relief cast pistons and getting the block decked to zero, too. But if I went that far into it I would do the extra stroke (if you can find the pistons) if that crank has the smaller 318 main size. If they weren’t so expensive, an NV4500 out of a magnum powered later truck with the married 205 ( 3/4 ton HD or full ton) or 238 (1/2 ton or regular duty 3/4 ton) transfer case and installing locking hubs would be fantastic. If you can find one, a 1981-1985 non CAD 3/4 ton axle with manual hubs is a good upgrade, too. If not, be sure to keep your hub bearings greased, especially with a lot of highway usage. I’ve been in enough NV swaps and can tell you that you’ll have to convert to the factory hydraulic slave cylinder clutch setup but no automatic comes close for the performance in a heavy truck, especially when towing.