nenofury, you are right on! the carb is a left-over from my circle-track days. i bought the carb new from summit, threw it on, adjusted the float and idle mix, and went racin! never had a problem on the SBC 355. after selling the car, i had two extra holley 2300's. both almost new, stock jetting. so, for fun i thought i'd try putting one on a 258. it made a world of difference! so, i put the other one on my other 258 and made the same difference. now that summer is here, i want to drive the jeep more. only problem is i don't want to smell like rich exhaust all day. so, i just need a place to start with the jets. if i knew what they 2300's come with, i'll make sure not to get anything bigger. i will do the final tuning with the O2 sensor and a volt-meter. thanks! matt