the car is running like crap. still. we have tried everything. the compression is good, the spark is good, gas is good, the machine shop didnt find anything in the oil filter when they cut it open, carbs been rebuilt, trannies been rebuilt.motors rebuilt weve retuned the carb and reset the timing a million and 1 times now. but the car still hesitates, sounds like it has a really healthy miss under any kind of load, and hesitates but nothing seems to help me my dad and my granpa have gone through everything we can think of. any suggestions? advice? please and thank you