Update....I pulled barrel and did a little filing on receiver where there was a high spot on the side then smoothing recoil lug on a whetstone. Reinstalled and set headspace which took a while because Marlin does not utilize a notch t keep recoil lug in place which is frustrating having it turn during tightening. Went to the range yesterday and first shot is about 24" low but no horizontal movement required. I pulled the scope and base and installed a Weaver 20MOA base and it brought everything up as calculated - only had to pickup about 6" of vertical adjustment in scope and never touched the windage. I will leave as-is and just shoot - cannot complain about the accuracy at all.