I've only ever been on top of the big block stuff, but a lot applies.
I would ditch the whole ignition system for a GM HEI conversion distributor. Those Skip White ones for $80+/- are actually really good dizzies. Superior system, and you can get replacement parts everywhere.
Alternator? I prefer GM here too. External regulators make me mad, and replacement parts like the stupid clips for the pigtail are impossible in a pinch. The later Denso alternators are cute, but the GM ones are a lot tougher, and usually more cost effective. Definitely ditch the charge circuit and run a 4GA+ straight to the battery.
When you go in there to replace the timing assembly, do yourself a favor and ditch the emissions broomstick for a real cam shaft. Not even about getting a hot rod cam. Just a good truck cam will be a world away from the curves-of-Olive-Oyl broomstick in there now.
If it needs exhaust manifold gaskets (probably does), use the exhaust gaskets with the heat shield extensions that rise up past the valve cover rail. Will keep the valve cover gaskets from baking from exhaust manifold heat.
If you do the fuel pump, change that fuel pump pushrod too. Seen too many that had fuel delivery issues due to the pushrod getting shorter over the life of the engine.