17x8 wheels on a 68 Cuda Fastback

So I ordered some 17x8 wheels with a 5.5" bs for the fronts on my cuda but instead I got a 4.75" backspace. Mocked them up and I'm thinking they'll fit! No interference on the tie rods or upper A arms and seem to fit in the wheel well pretty good! Any people kno for a fact these won't fit and I should just return them? Or try them out. I don't have the engine in right now so not sure how it'll sit yet but I don't plan on lowering it. Just making the wheel flush with the fender (no gap from top of wheel and the fender) thanks!

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