Yes it is a 1970 Mustang Boss 429.
NASCAR # KK2457
The boss is now fully restored to concourse condition. I am now in the process of rebuilding/restoring the engine. I will post some photo if I new how. Send me your e-mail if you want a look. firstname.lastname@example.org
The block needs repaired in one bore. It needs a sleeve. The head also needs a little work. Very repairable, I would repair it myself but I would rather sell it the way it is so the purchaser can repair it themselves. Also the parts are surplus as I have purchase the original engine for the car in the US.