Today something strange happened. First I found out not to long ago that my entire El Camino had original parts on it. Every single piece was original other then the Edelbrock intake, the massively oversized 750 cfm Holley double pumper, the flowmastef exhaust with CAT delete and the rims. Since then I've had to put a new front end on it. The entire front end, new alternator and starter and that's about it. Since I have had the car it smokes fairly bad. Enough that I don't go through drive throughs. The carb is way oversized and it's impossible to speed away from anything and it smells of gas and sulfer. Again I have no CAT on my exhaust. Oh yeah. It has a 305 in it. Today I was driving at around 40 mph when all of a sudden it started to sputter like it was running out of gas and ever since then it's feels like it is miss firing, runs like crap, rough as hell idle and it used to be if she sat awhile she was a bit hard to start and on cold days near impossible and when she would start there would be a strong smell of sulfer. But now she is hard to start no matter how long she sits and I smell gas and sulfer stronger than ever. The smell makes me think that the devil is about to pop up in my passenger seat and say. "Love the Elco." 2 of my carb bolts that bolt it to the intake have stripped out but are still holding a little bit. I can't spin them by hand but with a wrench they just keep spinning. I'm afraid I might have dropped a valve. And right before I was getting ready to replace a bunch of the seals and gaskets and reseat the valves and clean them up and go ahead and replace the piston rings and clean up the engine in general. Need some feed back on this. Friends say it's bad gas but the sulfer smell is what's bothering me. Thank you all.