It is possible there is a lumpy camshaft installed.
With vacuum gauge hooked up, come off curb idle, vacuum gauge should smooth out at 15-20 inches and be steady reading.
One thing you might try, insert X amount of feeler gauge shims in the back (secondary) barrels to barely open them. Start hot engine, now you should be able to turn down curb idle screw, which closes primary plates and idle mixture screws should have more effect. The more shims added, the less the primary plate opening, the more effect the idle mixture screws will have.
Once a good steady idle is obtained, typically 900-1100 rpm, inspect carb to see if Edelbrock has a secondary stop screw and adjust secondaries to this shim thickness.
Reset base timing, 10-14 BTDC?, and readjust carb. You will typically lose 200 rpm when trans is in gear, manifold vacuum should be steady, may have to kick up curb idle alittle.
Readjust trans throttle cable, shut engine off, hold gas pedal to the floor, unlock cable clamp at carb bracket, push back on cable housing. You will feel a little resistance for the last 3/8 inch of travel, push through this resistance, and lock the housing. Release carb.
Above all, be sure carb returns to idle from WOT, for your safety as well as others. This is most important. If it doesn't, fix it now.
Don't mean to sound like your father, just giving some good sound advice.
Others here will have some good info to help you, These I've given, I hope, will help.