Hey guys, I have an 81 Firebird with a 305 and th350. Currently with a 2.41 open rear end. I get incredible mileage but no get up and go. I'd like to keep the original 305 in it so right now that isn't up for questioning, but want to beef up the rear end. Would a 3.42 be too much for that 305 or would the power transfer nicely through it? Deciding between 3.42, 3.23 or 3.08. Any opinions would be appreciated! Thanks.