I have a stock 59 3600 napco 4x4 and would like to make a few low cost modifications to my truck to get some more horsepower. I was considering changing the camshaft and porting and polishing the head.I would also open up the intake and exhaust manifold to match the gaskets. Any recommendations on what cam I should use?

Another question I have has to deal with the stock differentials. The rearend will need a rebuild or replacement soon and factory replacement parts are not available. I was told a 12 bolt rear from a pre 73 chevrolet 3/4 ton will fit right in. Is that information correct? Any help would be appreciated