Would love to help....I used to tweak those heads all the time (aka "Mamofy" them....LOL).
Popular upgrade while I was doing that was installing a larger diameter lighter weight intake valve in it when I do the work (2.100 vs 2.080). That gives me a little more creative freedom in the bowl and valvejob as well
Best bet just shoot me an email...let me know you posted on LS1Tech etc. email@example.com
Look forward to helping you out!