[Dragncar]

I ran .030 restrictors in my 455 and drove it on the street and to the track for years. No problems. sft.
You can get a lot of oil through that .030 hole. If you have a issue with it run a .040-.060 hole.
No lifter company is ever going to tell you to restrict oil to their product, ever. All they care about are their lifters.
They do not care a lick about your main and rod bearings.
I see it all the time in industry. A sprocket might have a keyed tapper lock holding it to the shaft. And the maker says if we use Anti Seize on it it voids the warranty Never mind in the 35 years of doing this have I ever seen one returned for warranty issues. If we have a problem, I cut them off with a torch. And you can ruin the very expensive and hard to change bearing behind that sprocket with a torch. .
So I run restrictors on my Pontiacs and Anti Seize on my tapper locks.