A parts list, with gearing and tranny would be a great start.
A couple of quick observations though, a 390 running high 14s isn't horrible, in fact it's pretty good with stock exhaust manifolds.
I'd be looking at making 100% sure I was getting full throttle, the timing curve was right, and my balancer was checked to be indicating timing marks correctly.
Also, the distributor looks to be either in a retarded position or dropped in a tooth off (a tooth off is fine, but just an observation), but it looks like #1 wire is moved 2 spots over, but the distributor isn't turned all that much. Hard to tell from a picture, but incorrect timing and a stock distributor could rob it blind
Additionally, overheating could come from both retarded timing (which also contributes to low vacuum) and a bad fan/pulley combo.
As Drew pointed out, the more you list of parts and setup the better.