Re: rear gear
direct fit, 67- 70. They ran the trailing arm rear susp in the 60 - 66 generation too, but not sure what year it started... I want to say 65, but I also don't know if it'd be a direct fit.
71/72 would swap in too, but they'll have a 5 lug bolt pattern. You can most likely swap your 70's 6 lug shafts, but there's a 25-ish% chance your 70 will have the short shafts instead of the longer shafts that the 71 and 72 will have.
Any small block truck with an auto (c/10) would be likely to have the ratio you are looking for. (some years 307?auto had 3.73, but most small block /auto had the 3.07 gear)
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