If you want it to be peppy and sound good, but not over power the chassis, a nice 350 with a free flowing exhaust would work fine.
Something like a Comp Cams XE274, some cleaned up iron heads, performer type low rise dual plain intake, and a 650/700/750 carb. You will have plenty of power to put a smile on your face, an idle that will get everyone's attention, and you can spare the budget to put into the rest of the car.
Good luck with it whatever you decide.
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