If I were you and I was building a daily driver I'd invest in EFI before go-fast stuff.
https://holley.com/products/fuel_systems/fuel_injection/sniper_efi/Add in an electric fuel pump and return line and you're good to go. That'll make starting a lot easier, it'll run a lot better and gas mileage should go up. This would require an intake, however.
After that I'd look into a 200r4 so you gain some gears if running auto. That'd be good for a couple more MPG and a bit more pick-up.
Mine: 68 Camaro with a 250, power glide, Holley 390 cfm carb, offy intake, langdon headers, 2.5" exhaust, mild cam, HEI, and electric fan. Haven't touched the head yet. Only getting about 15 mpg but I'm not light with my right foot and it's running rich (not too rich. Just a bit.).
