You'd be surprised. I also have an 85 bird with the LG4 amongst the various toys, and I know others here have them too.
Is there an actual problem? Or just seeking more performance?
These cars aren't as advanced in the computer department as modern day ones. BUT, what they will DO is read a sensor measurement then give the correction for it.
AFAIK, the computer basically takes its readings and tried to adjust fuel to get around a 14.7:1 a/f ratio.
It does this by reading off the tps, and adjusting control till it hits one of the 2 stops. You may have had carb issues that were masked by the sick engine. The jets aren't optimal for a 350, especially if you added cam/mods to it, but should be generally functional.
But mainly, your computer is a dumb animal and doesn't "learn" much. It just reads a preprogrammed table to control things, and, isn't overwritten by 'tuning' like a modern engine. You could find someone around to burn a new chip. Hard to find reputable guys for that anymore IMO.
More likely check the tps, check your limit screws if you're pinging at the top end, and consider sensors with either carb rebuilt/rejetted based on what you actually see happening. Unless it's a wild 350 I'd think a properly working 305 setup should run things fine, and, and engine that sick may have had other issues in the carb/sensors that were masked