I have something too which might fit the bill. Its a 1969 TS250 set up for pre 75 dirt track. Has a TM250 top end and carb, an aftermarket pipe, and pre 75 replacement front end and wheels (a whole lot lighter than the original chrome steel units). Got all the original kit too, including oem airbox etc. It goes well, and gets points for 'unusual' (that's one word for it). You're not going to beat Elsinores on it, but gives other TMs and MXs a run for their money. Going cheap.