440 Oiling mods

Would love to oil my rocker shafts from the rear galley holes and get rid of the cam bearing method. Never have seen this done before on stock block and heads. 440/906/solid cam. Seems simple, fitting in one galley hole, other kept for gauge. Simple lines through the VCs and plumb into end of rocker shaft. 440 Source rockers and shafts. Am I missing something? Anyone ever do this?
I know a lot of aftermarket blocks and heads are done this way. I'm freshening the motor and want to take time this time around and get all the oiling advantages I can. Id like the #4 main to get all the oil it can, equal to the others. IE, not having it have to feed the valve train. Its driving daily and drivin hard.
I figured some kind of restrictor. Any guess on a good size to start with?