you may want to have your machine shop tap the crank and get a streetdamnpner or fluiddamnpner depends on the radical-ness.........scooter p.s i have a 283 bored .125 over is fine on the street 12:5-1 compression no issues and yes i do have msd 6-al with a pro billet distributor....my 2 cents lol...............scooter <again>