Timing question 318 with LD4B

If it backfires starting when cold.....but starts ok when hot, then it is NOT ign timing.
Could just be the choke is adjusted too lean. Stalling: have you tried adjusting the idle mixture screws for best idle quality/rpm. You should check the float levels, should be 7/16". Can be done on the car; no gaskets reqd if you are careful.