Can you get or borrow and AFR guage?
Can you get to a chassis dyno to get help in trouble shooting and dialing the car up?
Is it blowing black smoke, a dog at idle/off idle.
Somehow i think you would know if its "that" rich.
Can you get someone to video a burn out and a run ?
What does engine vacuum look like at idle in neutral and i gear?

Are the plugs black and sooty or white as snow?

How long did your fuel sit?
Down here is "really, really" easy to have ones fuel turn to engine puke solution- wont run for squat.
Checked floats/fuel pressure?

Is distributer locked out or on a timing curve- if on a curve, make sure curve is still intact( nothing gave up in distributer)

we recently had an MSD issue, actually the connector between distributer and msd box- i check that all the time now- grin.

Sure hope you can find your gremlin.
How are water temps?
Any pressure in the cooling system after the runs?