You need a poly trans mount with solid motor mounts. Personally I wouldn't run a solid motor mount. I hate mine and will be converting to poly when my motor goes back in. GM set the drivline angle at about 4 degrees in 69. Personally I would go with what makes the most sense at your ride height. Meaning level the rockers, get your rear end at ride height and experiment. You can shim the trans up and down easily with a spacer between the mount and trans. Your tunnel clearance will dictate it to some extent unless you modify the tunnel.
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Todd
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