Agreed needs to move toward drivers side to get 70atdc. 1/4 inch would do it. no need to slot the block if the counterbore is there. Just slot the bearings. Sanborn claims the mod was reliable for super speedway rpm of 7800 rpm. More than that with a 5/8 slot in block and bearing shell with dry sump. And this is almost continuous rpm. These mods cost very little except your time. What's your motor worth lol. Not too many stroker motors Reving that high lol.