I believe 8.30's in the 1/8 is like high 12's in the 1/4. I know my Dart years back ran a 7.86 which was a 12.31 and when it only did 8.0's to 8.10 it ran 12.50's to 12.70's. It usually 60 ft in the 1.70 area. With your mph and combo right now I dont think you will do alot better until it makes some more power. I mean dont matter what comverter and gear it has if it dont have the power to pull it you can only 60 so much. I would work on tunning and some more mph first. Most low 12 street/strip cars 60 in the 1.70's to 1.60's at best. To get low 12's you need close to 90 mph in the 1/8. I just dont think with the mph you are pulling you can 60 much better. Ron