With your budget, I would discount the fuel injection which will, in my opinion add a minimum of $6K and on the used market they are harder to come by. Depending upon your engine choices I think it would be possible for you to get into a new Back Draft at the high end of your budget .
http://www.backdraftracing.com/ Not knowing what part of the country your in, I suggest you call Jay Lenke at Vintage Motorsports.
http://vintage-motorsports.com/
Jay is good people and will give you alot of direction & assistance.
even if you don't get togethr with him. 1-888-427-1965