Check it out here:
These people are very cool and nice, supplied me with some measurements and answered some questions.
There are still tons of Dragmaster chassis out there. There was a "modernized" longer wheelbase version too, basically just front halved with slanted rather than squared off ) front rails. World champ Jim Nelson's "Two Thing" dual engine car was a Dragmaster. Pete Robinson, Danny Ongais (won the Winternationals ) and dozens of other ran the same basic car as the Mooneyes. Nelson even ran a Slant Six in one.