273 commando cam

This is Art Clark III. I contacted Camcraft about a 273 cam because I obtained a lot of confusing information on the "D" Dart. One bulletin dated April 18, 1966, said the cam was a 284* duration and gave some other numbers, valve open and close but no lift data. And, continued to recommend the use of a adapter plate and bolt on a Holley #4160. The person from Camcraft agreed that the cam for the 273 "D
Dart was confusing. I think Chrysler did this on purpose? The stock 273 4 barrel motor has a solid 244* duration with a 475 lift.
Other information on the "D" Dart was a duel quad set up with 392 Hemi valves in the stock heads at 12.5-1 compression and suggests "ringing" the heads? And, went on to define this car as a SS/D car?
I found a lot of info on www.seriousviewers.co,/D-Dart/infoball.jpg.
Also, on youtube there is a 66 Dart video. The Dart runs a 408 cu in motor with a "904" tranny, 4:56 gear. 10.64 in the 1/4 mile @ 123 mph! This car runs a 6.71 1/8 mile.
Now this Dart is a runner!
I don't know yet which motor I am going with but I have an 8 3/4 housing and will use it soon as I can set it up with springs, center section and Wilwood disc brakes. Have to have the offset before you can order the brakes? And, I will use a 727 tranny, the cost isn't all that much for the durability factor.