I would go with Johnson rollers, NOT johnson hylift, I have the expensive Morel hydros push rod oiling in my 512, I had to set them .020 from the bottom to quiet them down, wish I would have gotten Johnson's, if I go into my motor, I am going to try & make my hydros solid

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