Sat here for almost 3 hours and read about 95% of this thread until my old eyes gave out. Simply amazing car and build. Your dedication to detail and function is second to none, Your car comes off to the naked eye as a
"grass parked under a shade tree trailer queen" 
... then you see it being used the way it is intended to be and that is very much RESPECTED! I love it!!!!
Hats off to you and your Cammy. If I still have my car and I race at LVMS at the PSCA SSCN at the end of this year,, I hope you can swing by and check out the action
BTW about your dist gear..
On my car I run a bronze gear and removed the rubber O rings You may loose a little oil pressure ( IMOHO nothing to worry about) It'll add more oil to the gear, Been this way in mine since 2005.. just check with "your eng builder" for your own peice of mind..
Also another good practice is to machine an oiling groove above the distributor gear so it has pressurized oiling to the gear, and if you do it after timing has been set you can clock it so the groove oils the distributor gear and camshaft gear It cuts down on wear alot, better life with a bronze gear also. Use moly cam assembly lube on the new gear next time you replace it for break in....(If you didn't already know)
I was wondering who built your 489 If it wasn't JP? You can PM me the name if that's ok..