17x8.5

[GM Muscle]

OK i was gonna buy some tires for the rallys but the backspacing is all off and i found some temporary wheels..

Im going to order some motorsport z06 wheels for my 69 camaro and what i gather a 56 mm offset is a 6.95bs.. i was told to use a 2Inch spacer on the front but my wheel guy says 1".. and im confused.. ive done research and havent got a solid answer.. there is a car with 1.75 front spacer and 2.5 rear spacer.. claims no rubbing.. that would make the total bs on the front 5.2 and the rear 4.45.. does this sound right?

I would like to know exactly what size spacer to run on the front and what size to run on the rear.. the tire will be a 245/45/r17 all the way around.. my car is lowered and i do drive it daily. .i dont want any rubbing.