Just spitballing here- - - -no hands-on experience, but I believe the Art Deco frame rails are a bit narrower than the Advance Design frames. You might want to check with Achipmunk- - - -he's got a 1937 pickup with a 305 in it, but I'm not sure if he's still running the straight front axle. The Atlas would need some major oil pan modifications to clear a straight axle. It runs a cast aluminum pan with a very deep sump. It's also got an oddball bellhousing bolt pattern.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!