How would you rebuild this 318?

Ottmundr said
Check that first, cheap and easy fix.
if you want more oomph, consider lower gears. I wouldn't go lower than 3.91's. I have 4.10's in my car, and I am hitting 4k on the tach at 70 on the freeway. Great in town, or on the back roads where you have a lot of twisties to accelerate out of. It sucks on the freeway, a LOT.

I think that 3.55s are good enough for in town driving, they will get you good acceleration from a stop. I had 3.73's in my '73 dart and the

go-fish said
I like my cam (222/224 @.050, irc) but the 1:1 on my 3.21 rear gear is just not quite doing it for interstate travel. With the OD I’ll be able to be comfortable with the posted 75 mph interstates.
I can also cruise 1st gear in parking lots without lurching!

Do you remember what the lift is for your cam? The duration at 0.050 looks good to me