This is an updated version of sprint car which is based over 4 valve principle. it is mainly available in two series.
The sprint version with 4.274 inch bore and 5.118 inch stoke is the best to go for.
Is this a full size sprint, or a midget? Gonna have to be a tall cage car, or your head is gonna poke out of the top, a BIG NO NO. Even installing a straight seat bar won't be enough in most standard cars. If looking for used, try and find a Maxim, J&J, JEI. Maybe get a hold of Dale Blaney, see if he has anything used. He is well over 6'