Whats the drivetrain combo?
I find for a super excellent daily driver, the little things go a long long way. My first Magnum was such. Everyday useage bar none because there was no replacement for it. That car was "IT!"
It had a 360 in it stock and I addeed a few bolt ons. That's it. 20 mpg's and running on regular gas. I dumped the poor running 2bbl. for a;
Carter 625 on top of a OE 4bbl and a OE 340 trap door air cleaner.
I did dual exhaust off the exhaust manifolds into a H pipe exhaust and thrush turbo mufflers. I added a MSD which is a nice mileage getter, onto a junk yard distibutor because a vacuum advance was needed. Which also adds some really good mileage over the fixed lean burn distributor. The 904 was left stock save the deep pan, the gears were 2.76's with 26 inch tires on all 4 corners.
(235/60/15's)
The car had good power and drove really nice on the Hwy. Good passing power. Not so much off the line, but then again, with 2.76 cogs.......