The car seems to load up and not run very smooth, plus I'm getting black build up at the exhaust tips and subsequently on my garage floor if I run it long enough. I'm sure the carb is out of adjustment and needs to be leaned out. I haven’t got there yet.....I have a mechanical distributor, so no vacuum to worry about. I haven’t tried an adjustable timing light yet.
I'm not sure what "mechanical distributor" means, but if it's an aftermarket unit (MSD or Mallory) with no vacuum can, or someone modified your stock distributor to not use a vacuum advance, that could very easily be your overheating problem. A vacuum advance can pull an additional 15-20 degrees of timing at idle or at cruising speed, which will significantly lower your engine temps.
