For that tire to fit properly on a wheel you will need at leat a 10" wide rim. Is your new axle the same length as the original Camaro axle?
I would carefully measure how much clearance you have between the axle flange (where the wheel mounts) and the first major obstruction near the inner wheel well. Now measure from the axle flange to the inner fender lip (hang a weighted line from the fender lip to gauge the distance). Add the two measurements together, subtract 1/2 inch and that should be the maximum rim width that will fit with proper backspacing.
If you have tubbed this car then all this is a mute point since very wide and tall tires & rims will fit with ease.
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