Ordered my set yesterday after just recently stumbling upon them in a search a few days ago. I just took a gamble. Just now saw your post after replying above. A year of use, sounds like I'll be pleased then.
I don't think you need a blowfish bracket as the mounting of the shifter has to allow the engine & trans to wiggle within the chassis which the floor pan is part of. You could weld the shifter mount to the transmission, brace it, totally separate it from the car floor pan and if you don't use better bushings, you'll have wasted motion and a not so secure feel. Even with my Hurst C+ Billet, I used the stock Ford rear isolator rubber insert.
Back in the '70s we had the same issues with some plastic bushings used by some auto makers using Hurst shifters for the name, or Muncie Shifters in Chevy's. Switch them over to the metal bushings, huge change. My 340 Swinger had a Hurst stick in a molded block of rubber in top of a Competition Plus shifter, it came out in my hand on a 1-2 shift. (I wore out a couple drill bits drilling it to bolt like it should have been, mean while my Dodge Hurst had a pair of vice grips for shifting).