318 driver - cam change or not?

I would go with this cam if you do not mind the aggressive rate of lift
Howards Cams Hydraulic Flat Tappet Camshafts 711381-10
or this one if you do
Lunati Voodoo Camshafts 10200700
and these springs with either one
Trick Flow® by PAC Racing Single Valve Springs TFS-16901-16
and it would gain some power for sure.,As far as break in just make sure to use the tried and true parts you have (ignition/carb) and I would recommend a dedicated oil such as brad penn etc.
Yup that Howards camshaft should be a great runner, Howards has good cams, sunday morning cam swap should be done by dinner, lol hopefully

also try and find a 3.23 or 2.94 for 7.25 rear better gearing toward your driving habits, gearing has alot to do with MPG and with camshaft selection. you got to get it in the sweet spot in you rpm range, or else you would have a dog out of the hole getting less mpgs.