get a timeing light and start at 10* BTDC,then use a vac gauge to set curb idle along with the idle airscrews,shoot for a 750rpm in N idle

see what that gets,may want to use an un-lite propain torch arounD intake gasket areas and carb base looking for vac leaks..rpm will go up if it sux it in.

you could use vac gauge to get highest vac reading then check to see where the timeing is and tune from there.

hard starting sound way advanced and will run ruff and stall