Oil pressure question...I promise it's not another "who likes what' thread!

Should be a fun engine on the street Beanhead! I wouldn't machine a groove in my 440 head studs however, that is a small block mod and the big blocks have a dedicated passageway from the #4 cam bearing right to the rocker shaft saddle. If you do have a small block and want to ensure restriction free oil to the rockers, you can simply grind a small groove in the head bolt clearance hole between the linking the two oil holes. I use a longer carbide Christmas tree burr. Now there's no indexing of the head stud and no machining of your expensive new ARPs.
Back to your original problem, don't be afraid to shim the spring on the oil pump with a small washer if you want to increase pressure. The spring preload affects the amount of oil bypassing the pump. A little tinkering and you may be able to set your pressure exactly where you would like it.:thumbsup: