Hello, I am interested in getting into racing, nothing serious, I just enjoy vintage sleds and working on them and I thought what the heck, maybe I'll try racing. Iam 57 years old and have been riding for probably 45 years or so. I just don't know what class would be best to start in. I like the Merc trail twisters or Deere trail fires so Iam thinking 340 or 440 F/C? Your thoughts. Thanks for this site.