I would NOT use 1009 gasket, they can have an issue, the fire ring hanging into the combustion chamber, check that VERY close, I would use Cometic

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5