I've made the swap from 2 speed auto to M21. It is 1965 model....what shifter linkage will work? Are there a specific model numbers I should be looking for? Will any and all years work?

Also trying to figure out rear end ratio. Car will be cruiser, not racer and will be on highway quite often, so need to keep RPMs down best I can. 350 engine with mild cam and intake/carb upgrades. I've got 308 gears today, but thinking that's not going to work....maybe 3.30s or 3.55? Would I burn clutch up using 3.08?

Thanks in advance!