I have 302 that ran fine with a two barrel but since I converted to a four barrel it won't run worth crap.I put a holley on first and it kept catching on fire inside the carb every time it would pop. Next I put a brand new edelbrock 600cfm on it and now it doesnt catch fire it just consantly pops through the carb,the gas looks extremely yellow and i am at the very bottom of the tank is the gas old? any experience would be greatly appreciated