For anybody that's interested.
http://www.roushoil.com/10w-30.html
10W-30 FULL SYNTHETIC (API SL)
For Classic Cars and Flat Tappet Engines
This full synthetic oil contains high zinc/phosphorous levels for classic high performance engines, including protection for push-rod and flat tappet applications. Engineered for extreme protection and superior performance, but with classic engines in mind, this oil will help maximize horsepower and heat protection while ensuring long engine life and reduced wear.