Daily driver 318 roller cam expectations

All the engines you listed could give decent mpg and performance. All can be reliable as well.

• I've had great luck with mpg with Thermoquads on cast intake. I got 17 mpg in a '70 Dodge Truck with a 340, cam, headers with a TQ going a 1000 mile trip one way.
• I've also have good mileage with Holley street Avengers for gas mileage. The two I have right now do really well, though I haven't actually checked the exact mileage. I can tell that both are in the upper teens for mpg - - if I stay out of them :D