I don't have specific answers to your questions but I can tell you what I did. I put an LS7/T56 in my 71 Camaro. I used Moroso steel engine mounts on adapter plates and a G Force trans crossmember. I ended up about 3.5 degree angle which was about the limit for the headers I am using. Any less and the header collectors start to point upward. I also had to make a spacer for under my rubber transmission mount. I set the rear axle pinion to 3.5 degrees up and it works great.
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