Rear end swap for a GM 10 bolt
I'm in the middle of rebuilding my 37 Plymouth P-4 Sedan street rod. I am installing a rebuilt 1988 350 sbc bored .060 over w/ stock cam and flat tappet hydrailic lifters bolted to a 700r4 trans w/ stock torque converter. This package is replacing a 307 sbc w/ TH350 trans. Currently I have a GM 10 bolt reae end w/ 2.73 gears. I've been advised to change the gear to at least a 3.23 or a 3.42 to avoid premature overdrive downshift at moderate to highway speeds. I've learned my 8.2" rear end will not accept the larger gears, so I have to replace the whole assembly. I need a 60"-60 1/2" hub to hub axel to fit the body and I'm using 2 1/2" leaf springs. I have researched the Knowledge Base and found some data, but I'm just not comfortable yet with what I know.
Question: Is the advice I've received correct thus far?
Question: What make, model and year rear end do you recommend I should be buying?
Thanks for your advice.