Hi Jonathan, I will be working on a 73 Camaro soon so I can double check back spacing, but I do believe you are going to need about a 5.5 - 5.75 on the rear with 10" wheel. The 295-40-18 tire will be close you might have to roll the wheel lip. the front should take a 4 - 4.25 back space on a 8" wheel. I will have to confirm these measurements.
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