Ur prolly wanna hone the cylenders, re ring the pistions and at least check the block for cracks and make shure the oil pump works ( Drill prime it with valve covers off, if oil comes up to the rockers, it works ). I'd say screw the smogger motor and get somthing '71 or pre '71, save the hastle of fixing/ paying for machine work on a screwed up motor. If it was somthing like a caddy 500 or 472, I'd say it'd be worth fixing but not just another olds 455 which was offered in most full size olds like a delta 88.