Kevin not sure I would dump a bunch of bucks for some # stuff unless you want to be to date.Tom it’s funny you posted this when you did, there’s a ‘69 396/375 for sale near me right now. JH block, 223 crank, 291 heads. Dude wants 5k for it, it’s in pieces, and it’s already .060 over...may be the next engine for my 56...
You should look for some later 4 bolt blocks....it would save some money.