[Fot] Spitfire 1500 Engine-uses??/ a few questions

[N197TR4 at cs.com]

FoT,

How often is the Sptifire 1500 engine used in racing?

It was put in the Midget & Sprites (right?)

But I hear mainly of the 1275.......What other vehicles was this engine used 
in?

Thanks,

Joe (A)