I recall a thread on the PY forums years ago about the great door decal debate. I've owned two untouched, original paint 67's- both had just one on the passenger's door. Scott Tiemann, GTOAA judge and likely the sharpest Pontiac expert/restorer out there, also thinks just the passenger's door is correct. This is all like Charley's pet peeve "CAUTION FAN" decal thing, though...its just a decal!
That being said, I think one is correct and I also think that there are no absolutes with these old cars. Kwhizz actually owns a survivor GTO with both stickers and 842 aluminum heads I think
Bruce- the vintage race at PIR is both days, Sat and Sunday. Free to get in, just got back from there and it looks like a good turnout. Look for my black GT350 along with a blue mid-year Vette roadster and a yellow 66 Mustang race car (ex-Charley Lillard I might add) under a canopy along the front straight pit wall. I'll be racing as long as my new engine holds....
Colin