Looks like you need a looser converter by looking at your 60ft . , then see what a trans brake would do, your ET is WAY better than what your 60ft shows.
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
