Ben from Howards cams asked me to send him my cam & lifters to see if they can come up with an answer, Howards cams makes a Quality product & have always been very helpful to me, I will let Y'all know the outcome.

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