The original heads should be # 62. The standard 330 HP 400 engines all came with the 9779067 cam, a much milder cam than the radical 041 RAIV.
Since someone used some common sense in choosing to put dished pistons in your engine be thankful and leave them there. Swap to the 400 HO cam that Pontiac used that year, the 9779068 cam.
Chances are your gears are 3.23, factory A/C Firebirds in 1969 didn't come with 3.55s. I owned an all original 4-speed 1969 330 HP Firebird 400 with factory A/C and it had a 3.23 rear end.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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