Imo you need different gearing , 14-41 is stock and pretty tall for 300 feet . why would putting a longer swingarm make it not bog ? its just gunna help keep the front end down once you do take off . set up to launch in second only ! if your starting in first you have already lost the race. your 8s will not be enough. your swingarm will be fine , Key tip - tires and gearing are everything even with a big motor, if your not set up right your not gunna win shit ! . I would start by going up at least to a 43 rear sprocket ,