I purchased my Backdraft from FLP Cars in Joshua, Tx. Mathew is a meticulous builder who does a couple handfuls of cars per year (only BDRs and SPFs I believe). Mathew's attention to detail is over-the-top and his preparation of my car was perfect in every way, right down to the torque stripes on all the bolts. He stays in touch and always responds to my questions.
His site is
Fastlane Performance Cars (Backdraft & Superformance). My car/motor is pictured on his front page.
Good luck!