It's a very big Cobra Jet or something, built by one of the top engine shops around, BES. I could be wrong, but I think it's around 100ci bigger tham the Roadrunner's HEMI, with a few suspension tricks that I've heard were a tad questionable.
Good running car though.
Fellas....Before the "Tech Sharks" start really pulling blood, my error the 429 SUPER Cobra Jet is the motor. NOT the BOSS motor. I got Laney's ride crossed up with some one elses. FYI, the cube different between the two, is WAY less than 100! So, my apologies to all!! 
Do you know what the "ci" is???
I've heard the newer engine is in the vicinity of 588ci.....while Dudek's under 500ci. I've never been to a F.A.S.T. race, but people who have, have told me there are also non-stock suspension parts visible that help with a certain ford front end issue.
