What is the actual backspacing on a '84 Camaro?

I want to order 17x9 front and 17x11 rear and want to check the backspacing.
Thanks
Evan

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'99 Z28 M6 Red, 375hp,
'74 Corvette 383 Stroker, 4 speed,Yellow
'84 Z28 Racecar, big 355, Yellow
'95 K3500, Diesel, Dually, Crewcab, longbed

Backspacing in a 15x10 is 5.5" for the rear
So, the rear BS for a 17x11 should be 6"
not sure on the front, probably 4-5"