Big block K-frame & brakes question

Actually the steel mount that’s in your picture isn’t that hard to find. It’s the rubber mount that goes between the k-frame that steel mount is almost impossible to find.

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OK then; I'm a little more informed than I was when I woke up today. Thanks for that! I guess everything I would need to mount a big block is already there. Final question on this subject, What is this all worth?