We did mine by measuring where the stock center pin is and then making the chevys line up with that. We used a 4" drop hangar too because the chevys give close to zero lift and I didn't want to have to run a block (ended up with a 2.5" one anyway).
Ok A real answer <IMG SRC="smilies/wink.gif" border="0"> I hung a plumb bob from fram to center pin on stockers,left it there took off stocker and lined up chevys, I got 11"s center to center.
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