Scooter stay with it. I have saw 283s in the early 1970s turning 8 to 10 grand and not come apart. They weren,t mine i just didn,t have the nerve to push one that far. I have pushed one 6500 to 7500 with no problem but i still have a steel safety bellhousing or scatter shield as we called them back then that a clutch came apart in and it still totes the scars. Hey if you want to try one .100over i might sell you this block also some early 283 and 327 blocks were the same i don,t remember the #s but with a little help from some of the older racers maybe they might rembember