A-65 Continental 100 Octane Valves: HELP!

Ok gurus,

Last Fall, I developed trouble in one cylinder (leakage past the exhaust
valve as evidenced by hissing sound coming out exhaust stack when
pulling the engine through).

It only appears to be one cylinder, but I thought now would be a good
time to pull all four and convert to 100 Octane valves. Since the
engine is on an Experimental, I can use parts from about anywhere (PMA
not required). I plan to buy the valves from Fresno Airparts.

Question: My A-65 Maint and Overhaul Manual lists 2 different part
numbers for exhaust valves. 22211 and 21479. It says the 22211 is for
the A50 and A65 and the 21479 is for the A75 and A80. According to the
Fresno Airparts ad in Trade A Plane, the 22211 is an 80 Octane valve (it
doesn't say that, but it doesn't mention it's for 100, so I ASSUME it's
for 80). The 21479 is listed as Stellite and for 100 Octance. My
question is: Is the 21479 for 100 Octane the same physical dimensions
as the 22211 specified for the A65 in the manual and will it work in my
A-65? They also list another 100 Octane valve (654066) for $70 more
than the Stellite valve. Is that one sodium filled or something? I
just want a basic 100 Octane valve in the old bug smasher...so will the
21479 fill the bill?

--
Scott
http://corbenflyer.tripod.com
Building RV-4
Gotta Fly or Gonna Die