The fuel puddling in the accelerator pump is a sure sign of a carb that has excess fuel float height and is flooding...
Mark the balancer and tab, set it to 12 degrees, vac port blocked for advance unit...
Even if it idles at 1000 in neutral, that will come down to 800 when in Drive...
When you get timing set, throw a vacuum gauge on a full manifold port source...not the timed source for the dist vacuum...and tell us what the vac reading is...
I would try and get some money back from that shop...that carb "overhaul" simply is not correct...
I always add an inline fuel filter between fuel pump and carb...reduces chances of dirt entering new carb.
I would seriously look at an Edelbrock Performer 600 carb with electric choke...you would need a adapter plate...or perhaps a reman Quadrajet from a local auto parts store...
Stay cool mate
Aussie..aussie...aussie...
