If you are summer only and operate in warm temps, HD30 is okay. 5w-30 or 10w-30 is better for cold startup wear reduction. Your engine has no need for 20W-50.
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'70 GP Model J
467 Butler ported Edelbrock D-ports
Torker II intake with Holley Sniper 2
CompCams 236/242 hydraulic roller
Tribal Tubes tri-y headers full 3" stainless exhaust
TH400, 3.50 9" CurrieTrac, 245/35-20 Front, 275/35-20 Rear
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