Hi,
Fitting a 335 under a 67-68 fender is going to be really snug. Yes, to fit that much tire you will have to move the lower control arm bracket inward 2" per side. That equates to 41.5" outside to outside on the brackets. If you follow the mini-tub instructions correctly, that is what the inside tub to tub dimension should be.
If you have any questions about the install, don't hesitate to call us. We are a surprisingly small office so once in a while you may have to leave a message but we will ALWAYS get back to you.
888-388-0297
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