Big block 383 build!

I think it's a mistake to not zero deck the block. The block is taller than the factory advertised height. Some are MUCH taller. I think you will be struggling to make 9:1 depending on that height. Especcially on the B wedges they need to be decked to blueprint height.
Otherwise - wicked cool. I swapped a 400 into my truck years ago when it was still 2wd. It was a blast with a 3.91 SG.