Jeff - I just put 255/60/15 BFG radials on the back of my '67. It's fairly tight and 255/60 MT Drag's are a little bigger (wider). Short answer...yes. Try to find a wheel with 4.5" of backspacing. Mine are 5" and I had to use a 5/16" spacer to clear my leaf spring clamps, but I had a good 1/2" fender lip clearance. With the MT Drag's, you shoud be good with a 4.5" backspacing wheel, and maybe a little fender rolling/trimming.
You'll also learn if your axle is centered! Mine is not 100%. My 255's barely made contact with my driver side leafspring clamp, but made definate contact on the pass. side clamp...maybe 1/8" difference, but it shows when your trying to squeeze tires in!
Also, every car is a little different. Everyone seems to have different experiences from what I've learned here! You may get lucky and toss them on with no interference! Or you may have to trim/roll your lips...
Finally and I'll shut up....dont settle for 235's! Make 255's fit, you'll be glad you did...and post some pics and your experiences when yer done!!