car still diseling run on prob

dang i sure need to get a video camera thingie,I have a 73 340 marine engine in my duster 10.5 to 1 comp crane fireball cam and none of these problems,I set the timing to the fuel I use(by ear)87 octane....and check with timing light with dial (snap on)32 degrees total.14 initial it idles at 1200 and has no problem startin or shutting off when hot...with holley 750...with edelbrock 750...hard to restart hot and ping's if you get on it but no run on problem...burnt noticed the boosters dumping gas at idle so we recomended replacing the o rings on the needle and seat assembly,that should take care of the boosters at idle problem and maybe the extra gas dumped by that problem is causing it?maybe the distributor is a toothe off?any help appreciated