Update - I bought a variety of LED bulbs. I've been pretty happy. Some were disappointing. (As Dave pointed out, the ones intended for the tail lamp don't output much light)
I'm still experimenting - my printed circuit is crumbling so I can only get a couple of bulbs going on my dash. I'm about to fix that, though.
Bought everything from autolumination, except for a couple of other bulbs that I ordered (and haven't tested yet) from Firebird Central for the dash ( LIG-903 ).
I can put a rundown together shortly.
1968 Firebird 400 Convertible Original: Engine, Intake manifold, Heads, Body, Stereo, 3.08. THM400. Engine rebuilt by Ken Keefer early 2012. New: Holley 4bbl 670 HP, hidden iPod setup, RobbMC mini starter, A/C, front disc brakes