B Body rear end in a 71 demon

Hi everyone

We put a 66 b body rear end in our 1971 Dodge Demon

My question is what would be the offset of the rims

I would like to use either A Centre Line style American Racing 15 x 8 the reason for this is we have a set of 15 x 4 Centre line rims bb pattern

The other option would be like a 17 x 7 x 114.3 up front and maybe a 17 x 10 x 114.3 Mustang Bullitt style rims

Anyone know where we could buy these new or used

Thanks everyone