Re: Front Disc Conversion question
First I don't think it's ever been said that disc conversions move the wheel out 3/4". The big brake conversions using a drum hub require longer studs because the thickness of what is refered to as the "hat" area of the rotor is thicker than the drum. At that, the difference is about 3/16" maybe 1/4" but certainly not 3/4".
I don't know if there is a difference from drums to factory disc's, except for the one boss on the spindle the mounting surface for drum and disc is the same.
Your 3.75" backspacing is not optimal if you have 7" or 8" wide wheels. As an example I just switched from 15x7 (4.25" bs) rally wheels to some 15x7 restored vintage American 200s using the same 215/60/15 tires on the '72 Nova (stock height) and the tires hit the upper most fender bolt on even the smallest bumps. The rallys never hit or rubbed!
Now your '67 with round wheel wells is a lot more forgiving depending on if the car is stock height or lowered. If you are not having any problems with the tire/wheel combo you have with drum brakes a stock style disc conversion probably isn't going to cause you any problems.
Get a second opinion from a vendor that sells a lot of brake conversions, Matt's Classic's comes to mind.
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