273 advise needed

A lot of good advice here. First of all, decide what you want the car to be: (survivor, race car, restomod, restored) and let that guide your decisions.

I'm kinda in the same boat with a 66 Dart Charger 4 speed. Since this will be a street car I'll be looking for torque.... max power at high RPM but with no bottom end is not for me.

Good luck with whatever you chose.