Mgw or barton trans mount will fix your issue
I can't imagine it is significant. The only difference that I can see is the small amount of compliance on the Blowfish - uses very small rubber isolators to attach to the rear of the shifter. There is very little side to side play with the Blowfish. The MGW uses harder bushings with a bit less play and also replaces the factory shift linkage too for what that is worth. Would be interesting if a Ben Calimer tranny job is the real answer to the lockout issue (or Ford stepping up their game a bit).Do those shifters do something different then the blowfish bracket? I mean from what I've seen they both just mount the shifter to the trans eliminating the mount to the body.
I drive my cars pretty gently and wouldn't call shifting at anything above 4k while merging onto a highway drag racing. I would call the 2-3 sec of deceleration while trying to get the car into gear a safety issue and unacceptable in any car, let alone one designed as a performance vehicle.You will need 2 things...
A good clutch upgrade. High rpm shifts are just iffy at best with the stock clutch.
The MT-82 isnt perfect but it isnt the dogshit everyone claims it to be. It was never designed to drag race and thats the main issue. It is a GT car and designed more for road racing.
If you only want a drag car that you like to dump the clutch at 4k then upgrade the an xl or tremec tr6060 but plan on about 5k in your budget. Plus the shifts will never be as smooth as the MT-82.
George