x2 on the Brad Penn 10/30 oil. I have been using it for years in both my 427 & 428 FE drag engines, as well as my 331 SB Ford, all with flat tappet cams, and will be using it on my new 428 CJ street/strip engine. Several of my buddys are using the same oil in their roller cam engines, all quite happy with Brad Penn.
428 powered Fairmont drag car, Best ET:9.97 @132.56MPH, best 60 ft: 1.29
59 Meteor 2 dr. sedan 332, Ford O Matic
74 F350 ramp truck 390 4speed
1985 Mustang 331 4 speed Best ET10.29at 128.7mph, 1.40 69 foot