New to site, new to Mopar overheating issues

D's Nuts and Bolts said
The casting # is
2780930 340-3 – 1968-1973, 340 LA-series small-block, Not T/A or AAR

Yes unfortunately the guy I bought it from know nothing about the car, I contacted the guy he bought it from (another dealer) and he doesn't know anything either. Honestly, it's a good car, but I missed several things while looking it over. Missing kick down cable/linkage, dash lights don't work, radio, heater didn't work (fixed heater), they had the transmission fluid way too full, and obviously the over heating issue. Granted some of the stuff you can't spot or don't think to look. Happy with the car just kind of pissed the guy wasn't fully truthful.

This is right out of the 1973 Factory Service Manual. You can see for yourself what the factory did when it wanted max cooling. I always want max cooling. You can run more compression, less jet, full timing and more IF you control the temp at 180 or a bit less. I use 170 for temp if I’m running a heater. Otherwise it’s 160. It won’t wear out quicker if you get the tune up correct. I want to be able to run the most compression as I can, on pump gas, and STILL me able to drive through downtown hell and not get hot.

Some of this doesn’t apply to you, but really it does. The better you control coolant temp, the more forgiving everything is.

The columns from left to right are 198-225-318-340