Using a roller cam in a pre 85 small block

I've only done the roller swap one time but when I did the oil galleys had to be sleeved or the lifter bores had to be sleeved so as not to loose that valuble "lifeblood" of oil instead of to the bearings that are fed through the same "vein" so to speak. you may want to consider some chamfering around your bottom end oil passages also while the block's at the shop