Looking for a 8.25 or 8.75 read end...

i have a 73 dart and have been running my 7.25 behind a 360 for about two years now. I am getting tired of the slow launches and and startin to worry about breaking somonething so if anyone has any info on any of these rear ends let me know. I would perfer to have a good street gear and have a limited slip or at least sure grip and i would like to stay away from cutting down a b-body or anything bigger....btw im in cincinnati but im not to worried about driving....