360 block to start with?????

Except for the 71-73 they are all the same. Those early ones were cast off the same molds as the 340 and can be bored much farther over. they are all good choices, though. I guess you are speaking of the LA and not the Magnum engines? I got a real good complete 77 model with 55000 miles on it if you want an excellent core. I'm in Georgia, though.