For my A518 I had PATC custom build mine, told them my engine combo & they nailed it, so far so good, 3500miles of abuse .


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