I have them in my 512 ci street strip car, they said to use cast core, & non coated lifters, 2500 street miles & so far so good.

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