lifter galley crossover tube

Never seen that before.
Me neither but I like it. short/concise/easy. & what Moper said, Like I saw in the pics when Larry Atherton Of the old now defunct A&W performance did it way back (he may have originated it, his story sounds convincing!) use 45 deg high flow fittings such as the blue alum npt/an ones in the speedway mtrs catalogue (if pics needed) but would be available from many sources. EDIT His take is to reduce the speed past the #4 main (by bleeding some of it right before that turn over to the dr side) so enough flow can still make the right turn down to that problematic #4 main. Opening the 4 main feeds to 9/32" is suggested. #5 already has plenty.