Aftermarket wheel spec question!!

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So I have my '72 lwb I've been restoring haven't posted any pictures lately but been getting paint and body work done. I've got the 1" lowing springs up front with the cpp control arms and shocks and the 3" drop in the rear with the cpp shocks and shock brackets I want the to run 17"s that look like the factory rally wheels I want the front to be just whatever width possible to ride good and have plenty of clearance but I want the rear to have that little wider deep dish look and was wondering what the max specs are for the rear without having to narrow the differential and I also have the cpp rear disc brake kit too incase that matters any. Thanks