318 and 360 gas milage question

I had a 74 flat bed grany four speed and wish I had it today.
318 2bl 24 miles to the gal.
If I was building a street rod for look's sound and gas milage it would be a 318.
you can pick one up to build anywhere and if the day come's that you want more power build it up or just change it out for a 360.
Gas prices are making me rethink my direction too.