All for .370 lift and under ........

Power isnt always followed by an increase in mpg, more than not.
Carburetor, 350 cfm holley
Headers, the small 1 1/2 milage kind, long collector extensions and dual 2" ,option an H pipe.
Windage tray, multi spark ignition , air up tires to 6psi below max hot.
Build a pointed nose cone for it.lol