392 stroker oiling problems

the block was tubed, notched for the stroker, an the oil filter housing cut back for the dry sump setup when i got the moter. i did not do any more to it the first time i put it toghether. they had let the valves get out of adjustment an lost one when i got it. second time i turned an straitened the crank an line honed it. cant tell that the caps are chattering or walking, just looks like starvation. running a 4 stage aviad pump with three suckers out of the pan. they are 12,s. the feed runs through a oberg then to the block. its a 10. running a stfehs pan with a built in screen but no windage tray. pretty sure its not the pump because i ran it on a big chevy after i lost this moter. the crank is a steel 3.79 . has a 8 bolt flang. never have had this moter on a dyno but i would guess its puting out somewhere around 650 horses. thinking grump might be on to something with the notches or core shift. have noticed that when the block was tubed the 2 pieces are not perfect. there is just a little lip where they come together in the middle. could this possibly cause a bubble or enouf of a restriction to cause a problem? also i feed the chevy with a 12. looking at the tube in the block im thinking a 10 should be plenty. any ideas?