I was running the Rotella 15W-40 but switched later to GTX 20W-50. I have a .509 cam and usually throw in a bottle of the Comp Cams break in lube. However, I bought a bottle of Lucas Zinc additive the other day at Napa for $12. I only change my oil once or twice a year because i don't drive the car much so I don't mind spending $12 on a zinc additive.

BTW, this is in a decently built 440. I have about 70lbs @ startup and around 50lbs @ hot idle. Not sure if I answered anything but hope it helps you in some way.