340 intake/carburetor advice

you'll be hard pressed to beat the stock cast intake and an Edelbrock 600 on the street for both cost and performance and mileage..but you didn't want to hear that.
On the strip a bit bigger carb would be a benefit at the big end.

Ive run that combo before. If it is mildly cammed with 3.55 & down, BTDT & it’s good.