318 engine build

I'd take Rumblefish up on his manifold swap. The LD4B is designed for the smaller 273/318 intake ports. With the low compression, the engine won't tolerate a lot of whoopee on the cam and be decent to drive on the street.

You can gain a little compression by using the thinest head gasket you can find. Using pistons from a 67-70 318 will also help.