Good to see you are making progress..now that it will at least run and sort of idle...getting the carb right is next step....
You need to either...get the shop to refund you for the junky job they did on the carb...or...put it down to experience and grab another carb, either an exchange rebuilt one from an auto parts store or maybe google guaranteedcarburetors. They have rebuilt Quadrajets for $198 inc shipping...
"not a plug...just a simple parts assist admins"
One critical thing you should add is an inline fuel filter between the pump and the carb...
Once you have the carb right, set your idle to about 700, block off the vac advance and set timing to 12...BTDC...reconnect the vac line and set your idle to 700...in Drive....MAKE SURE SOMEONE IS IN THE DRIVERS SEAT WITH THEIR FOOT ON THE BRAKE while you set the idle in drive.
Good point made earlier about fuel dilution by gas flooding the carb...once you get the carb right, and before you drive it on the road...change your oil and filter...
You are doing great...there are a lot of us on here more than willing to help...
