Re: 69 SS 396 COUPE front spring issues
My 638s had "638" stamped into the top coil. They were 1980s vintage, so I don't know if newer ones would be stamped. The 5370s I just put in were not stamped.
As Bill noted, the backspace is really important, particularly on a 69. I have 215/60 15 on my 69, with 4.75 inch BS, and no rubbing, even when the car had 638s with a coil cut off (very low).
Do you have any pics you can post, and give a little more info on where it rubs? I assume it is hitting the inner fender bolt heads at the top of the wheelwell.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!