I ran the comp solid roller 286r which is a size above yours. I did NOT bush the lifter bores, ran about 5000 street miles and made several trips to the drag strip. Believe it or not this was in my daily driver for four months. I was very happy with the results. I always had 60-80lbs of oil pressure and went 11 ohs at the track with a pump gas 408 and edelbrock heads. Id like to add that it had a ton of torque right off idle and 13.5hg of vacuum. IMO bushing the bores would be a waste of money.