I'm running 14" wheels on the front of my '67 and 15" on the back. I plan to use 255/60 tires on the back. Any opinion on what tire size would look good on the front? Thanks.

With a decent suspension, 235/60's are about the widest you can run in the front, without rubbing. That's the combo I run on my 69'....KZ

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John D. Smith
69' SS/396 CLONE!
http://www.geocities.com/kz1000ltd/

I have had 14X7's with 225/60's on the front of my 67. With stock springs there was no rubbing. Once I changed to 2 inch lowering springs, they rubbed on the outside. My rims had only 3 1/4 inches of backspace. With 4 inches of backspace, I think they would have been fine.
On the rear I had 15X8's with 265/50's. Rims had only 3 1/2 backspace. They rubbed pretty badly on the outside also. I think it would take 4 1/2 inches of backspace to fit those 265/50's
I would suggest using rims with as much backspace as you have room for, to avoid clearance problems.
Rich