Wheel size help!!! 73 roadrunner

[BlooDSMeaR]

I have a guy that is 2 hours away with a set of wheels he had on a land-rover Freelander. I know the bolt pattern is 4x4.5, I asked him what the back space is and he said "3.5" I know the best fit of wheel for a 73 roadrunner is 4.5 BS, will these fit OK? I don't want to spend 4 hours in a car to find out they are the wrong fit.... again... As I already bought a set of turbines that wont fit... PS any one need a set of Chevy pattern turbines?

 

[Basket case]

when I had my '73 back in the mid '80s, I ran 15x10s with G50s on it.No idea what the back space was.
I have 15x8s on my '69 with 3.5 bs.

 

[BlooDSMeaR]

So I have found through testing fitting and research,
I can fit a 305/45R17 in the back on 17x9.5 with +6 offset and 5.5" of back space.
I have the cal tracks springs with a +1" for height in the back.
After buying the new wheels and tires, I wish I went with a 20" rear wheel and run a 31" rear tire as there is ample room with the +1 springs.