So yeah, I just realized I had a dumb moment. Front and rear axles have to match. At least the gearing does. So I need to identify the gears in the front. I'm going to do some googling to find out what ratios were available for the fronts on the 87. As for the rear axles , I think the Eaton is the better choice over the 10 bolt. But then I have 8 lug rear and 6 lug front. Conclusion ... Beat the 10 bolt until it blows up. I would rather have to replace that then the original rear anyways. Back at it in a couple hours.