Carb jets, where do ya get them? How hard are they to install? I have 85 Jimmy, I believe its the stock carb. Anyone know what came on the 305? Yeah, I know, bigger engine is needed, but thats not for sometime. Whats this about offroad jets? Also, those performance chips, most say to use premium gas, what type of results do you get with them using the cheap gas? I would imagine its pretty close using the cheap stuff, compared to using the premium gas. What brand chips are better? Do they really help that much?