picked up a 77' CJ7 with a AMC 304, guy said the engine might have been buit but wasn't sure. it had a carter AFB on top but the thing was shot, missing linkage...ect. so replaced the carb with a new Holly Truck Advenger 600 electric choke. tuned it out on a no load situation ran great but when i try to drive it. it will idile in drive but the minute you touch the gas the thing stalls...timing is 5 advanced...duel points distibutor w/ mechanical advance....runs good at idle but won't run. Help....please