Choosing the right stroke for a 340

Sounds like a race car builder Ed Quay, Ray Barton, S&W Race Cars....they are in my area you'd have to find one in your area or google "Performance specialists" etc.
I am not sure there is anyone here in the Phoenix metropolitan area anymore. We lost so many shops and the race track closed this year. My trap range closed as well. And I am NOT taking up golf!