Hmmmmm, 198 issues

Ok- today I decided to do a compression check on my 1970 198 in my 1970 Duster. 1-6, 90-90-90-90-90-85. Definitely low, but pretty even and remember I live at 5000’ above sea level. At any rate, I’m a thinking the old girl is kinda tired and needs a freshening. As I see it I’ve got a few way to go- a few years ago I was going to put a 340 in it to make it like my high school car, alaskanTA talked me straight out of that since the entire car except the radiator is original and plus I kind enjoy the slant.
So now, should I freshen it up, or maybe hop it up a bit- reground cam, offy 4 bbl intake, increase the compression ratio by milling the head and/or block, get the head cleaned up a bit, maybe with bigger valves, maybe use the offy and Gill Welding to go MPFI? I don’t think I want to do forced induction, because I’m old enough I really like my A/C.
The other option is to return to the small block idea, will need new trans, drive line, rear end etc.

Car is 1970 Duster, 198, 3 speed A903, 7 1/4 rear end.

Thoughts?