74 tbird overheating and deiseling

I need some help here. I own a 1974 thunderbird with a 460 engine. Fresh rebuild. Did it myself but having issues getting it running right. It ran fine up untill the gas went to varnish. Car has been sitting. There is fresh gas in it now. Since then its been a Headache. It starts but runs very hot to the point it deisels.. Seems like the carb is dumping gas into the intake. It will start and idle but when you squeeze the gas pedal it will backfire and shoot gas up thru the carburetor. Car runs so hot it deisels when i shut it off. I can look into the radiator while its running and see coolant flowing thru the radiator. Both upper and lower hoses get HOT.. It has a new edelbrock 1406 carburetor. If you squeeze the throttle ever so slowly it will go up in rpm. But if you goose it. Itll stall and gas can be seen coming out the carb. tried adjusting the timing and still cant get it to run right. It has an aftermarket mild cam in it. Summit sum-3500. Im grabbing straws here as to why its acting so hot. I do know that when you get behind the car its running rich. Any help or ideas as to what may be going on here would be greatly areciated. If i forgot any info plz let me know. Its a project of 3 yrs so far. A big lawn ornament for now.