I would run mufflers for sure so I could hear the engine, I don't think there is any advantage there to not running them.

You should choose your oil weight based on your main and rod bearing clearances. 10W30 in general is good. But that 20W50 BP and VR1 is stickier. It gives me a warm fuzzy feeling when the car has been sitting for weeks so I run it.

And yeah I'd run boosted zinc levels in the first oil change or two after break in. It may be overkill but better to be safe than sorry.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street