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Why would the engine mounts be different? They are both B-Blocks. Other than the styles. You should be able to use your 400 engine mounts on the 383 no problem.
Yes use your 400 brackets on the 383. Nobody carries the BB brackets just the SB ones but you can buy the rubber inserts in both rubber and poly.
Were talking 73-up spool mounts.
engine mounts changes on this case due the car not the engine. So since you already have a 400 with its mounts, just need to use the existant mounts the same for the 383.
you can replace the bushings. Rubbers should be available at any parts shop