First of all, welcome to the site
Where in NY you live?
You should be able to swap seats pretty easily if you have the mechanical know-how.
You'll be ouside the limits of reliability for the motor and transmission at your desired power level. Until you have another vehicle to drive and the money to replace the broken parts, lower your goals.
As for "where to go", there are a bunch of decent places in the northeast. I have no personal experience with DynoFlash. Maybe someone on here has, and can chime in.