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That's pretty tight. I'd use a 10W-30, pre-oil it before startup.
Fill the carb bowls & set timing so it fires quickly.
Driven, Lucas, and others have break-in oils, haven't had problems with any of them.
Buy a quality 5/30,10/30 or 30 break in oil. Do it right the first time. Joe Gibbs driven, Brad pen, Lucas oil. Your clearances are too tight for the age old 20/50.
Forget the ZDDP additives, how do you know that crap will mix in & work with whatever oil you are using? You don’t.
Current shelf oil has too much detergent and it fights with your expensive ZDDP so it won’t function like the bottle says it will.