440 bottom end strenght tips and oiling

For most anything the cam bearing groove is okay, the main reason for tapping the main galley for the rocker feed is to not rob the rod bearings fed by number four main bearing of any oil. Restriction of the oil through a controlled orifice will certainly help, as long as the rockers get enough. Agreed, major PITA, and there are several different ways of accomplishing it. MRL racing does it through the rear china wall with bulkhead fittings and hard line to the plugs at the top rear of the block. It's safe to say if you're at this point anyway you probably need to be looking at an aftermarket block anyway, because a dual line high volume oil system can keep up with the demands of top fuel. But being semi affordable blocks are extinct for all intent and purposes, some are just having to make the best with what is available in the here and now.