I am going to be replacing the runner gaskets to stop a vacuum leak and while I have things apart I figured I'd also replace the fuel injectors with a set of Bosch IIIs from FIC. I also have a valve cover leak and a leaking valve seal so I'll replace the valve seals and the valve cover gaskets. I have fel-pro gaskets and valve seals on order and the fuel injectors. While I'm in there are there other things I should do?

Before you answer here are the vitals on the car:
Stock 1988 L98 with 186,000 miles
Daily driver, not track.
Puff of smoke on startup, otherwise fine
I replaced the intake manifold gaskets about 7 years ago along with the EGR valve, switch, sensor, and fuel pressure regulator (adjustable).
I also had the fuel injectors refurbished by cruzin performance.
I cleaned the throttle body and replaced the IAC and TPS a couple of weeks ago.

Car idles terrible thanks to the vacuum leak (I suspect)
I had a hard time finding the vacuum leak. I checked each hose with a mighty vac then sprayed everywhere with a propane torch and couldn't find anything. Finally I used some throttle body cleaner and sprayed around. The car definitely responded when I sprayed cleaner around the base of the rear passenger side runner. I found one of runner screws was quite loose so I tightened them all without resolving the problem. It just dawned on me that my intake could be leaking again too.

are 1.6 roller rockers worth my time on such a high mileage engine?
How about springs, push rods, etc?

I'm not looking to pump up the horse power (at least not yet) as I spend most time driving in bumper to bumper traffic just itching to put my foot down.

Ron