I just reinstalled my sub frame and I used the holes in the bottom at the front of the rear frame and the locating holes at the firewall on the subframe....assy manual says they should be 76" cross measurement each side. As another check I used the rear edge of the very front core support bolt hole and measured across to the center of the top fender bolt on each side..again going from driver side to pass and pass side to driver and got it within a little less than 1/8" difference on each measurement so I was good to go. I think the factory used +/- 1/8" or +/- 1/4" Either way, they didn't get them as close as we do now. It really wasn't as hard as I thought it was going to be.
Brian
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