Small block differences per application

I don't know about going too new. I think i like the idea of keeping it closer in age to the car. BTW its a 68 valiant signet
Do some more research. Rusty is right. Starting from scratch kind of a no brainer not to go with a 5.2/5.9 Magnum, Plentiful and reasonable. Better power, Better compression ratio, better flowing closed chamber heads, roller cam, and they suffer significantly less wear then an LA engine with similar mileage. Installed they look nearly identical and no worries of wiping out the cam. LKQ guarantees the engine run. With a cam and 4bbl can make some respectable power. Or source an older LA 360 with an overly optimistic 8.5:1 compression and start throwing money at it. If you end up in someones backyard don't buy anything you can't hear run and holds water. Now way to tell if it's been over heated, cracked, froze what have you.