well, oviously I really don't know what Im doing. I feel like Im going in circles sometimes . I could have swore that as a kid I counted about 3 turns of drive shaft to 1 turn of tire but I was wrong. I bought a cos 307, when it should have ben a 331 cou. I plan on making it posi and have rear end rebuilt. I want all rebuilt drive train is my goal and am courious if there is a 331 out there. The 70 suppliment showed the open end to be a 307 or 331. I guess there could be a 307 forumla ra3 bur the 71 suppliment shows 70 as an open 331 and 307 open was sports option what ever that means on esprits and formula auto tran cars. It also says the 70 formula HO got 331 open and the formula with mountain package got 331 open. Im thinking the formula HO is a formula ram air 3 but not 100% sure either. Maybe Ill just run what I got but a 331 would be Ideal. Yes Im confused
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