7 1/4 width question....after searching

I found a BBP 7 1/4 with a 3.23 gear. But haven't bought it yet. The price is a bargain. But what I've gathered from this info is if I put a BBP 7 1/4 in place of my SBP 7 1/4, I will for sure have to get different wheels with a different offset , due to the wheel contact is now closer to the leaf spring and of course my wheels won't mount to the 5 on 4.5.