I have not checked the compression on the Macro yet. Single I have and its a bit over the specs on 3 of them and just over the specs on the cylinder 2 I think it was.
For having 240k on the clock and 30 years old. If its just the valves then its not bad. I know the pick-up sat somewhere for a while though as the gas tank was all rusted and the filter was nicely packed with rust particles. That has all been tended too now.
The alternator is a must for sure if you want to do more electrical in them. Currently with 45A if you where to drive at night with all lights on, a radio going and the AC you pretty much cap out the 45A already. An electrical fan is going to be somewhere between an other 10-20A load you have to find space for.

Hehe, my lilbro had a 4x4 a few years ago he put a light bar on ( halogeen no LED or power savers or anything ) but no adjustments to the power plant. Put all the lights on and the car started stuttering due to lack of electrical power for the sparks. Them old days where he did all these "funny" things. Always had to be bigger and brighter :D

Alternator regulates its output anyway to having the extra power for todays gadgets and such is a nice thing to have available anyway. I still plan on putting a power inverter in there also.

Sooooooo many plans, soo little time, money, and too many other "things" that prevent me from doing much at all.