The later rear end is about 1" wider overall - I have the same issue on my '64 as I have a 1970 12 bolt.
In my case, we transferred the brakes I had on the old rear end to the new one - but to be honest - I don't know if they are 2" or 2.5".
Even with the wider rear end, I can still run 255/60/15's on standard GM 15x7 steel rims (4.25" BS).
If you are buying new wheels - I'd go with the wider brakes and just buy rims with whatever BS you need to fit your tires of choice.
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