Timing issue?

Ok where do i start. So the issue i have been having is when i start my car from cold let it run and idle it seems fine. once it has warmed up some i will drive it and it runs really well . especially with my new summit 600 cfm carb . after a hard drive it once to peeter out and idle ruff on me then barely makes it home. once home in the drive way it starts to idle rough and die at normal operating temp for me is 190. So yesterdays project was i removed the electirc fuel pump and pressure regulator and went back to stock cam driven oem pump . seemed to help bc i thought it was gettting to much gas at the carb . like i said new holly style carb on it now . and trying to get used to it still. not sure how to adjust the back float either that sight glass is plum full front sight glass is half where i think it should be . also says there should be a high idle screw on pass side of carb near choke i cant find that any place trust me looked all over. so just working of adjusting curb idle. It is around 10 degrees BTDC but fluctuates between that and 8 . when i set my timing i made sure the balancer lined up with 0 but what to i need to do exactly to get it to coincide with blowing my finger off at cylinder one and getting the balancer dead at 0 ?? bc i have not been able to achieve that. so to recap runs great cold i go drive it runs awesome when it warms up it runs like hell then idles and dies very frustrating! thrown every damn part at it new and still can not get it to just run. i know. enough about it to obviously get my self in trouble between youtube and beer cant figure it out and im at my damn wits end on this car . its a 74 scamp 318 AT. any help please will be appreciated. for everyones info these are new on the car with in the last month or few.

Distributor OEM. blaster 2 coil. alternator . ballast resistor. battery . alternator plugs cap rotor wires . summit racing carb and spacer. ignition box blue one . radiator water pump belts gas tank fuel pump ( mechanical)

im wondering like i said did i not time it right ? or is my chain stretched and wont hold time. idk. obviously thats a fun gamble take half the front of the engine off either its good or stretched. i know its a 34 dollar part at carquest but what do ya do lol

thanks for looking and appreciate any help.