I have a Hurst. Tator always recommended the Hurst. I bought it from him. I don't think there is much of a difference from the B&M or others. I'd buy the least expensive one you can find. SVS IIRC is quite pricey, maybe that has changed.
With the Hurst, gears click into place with relative ease compared to the stock shifter. With the Hurst shifter you have to get a special knob from MGW to fit (or the ugly one from hurst), as the rod is not removable like the OEM mechanism.
I just installed a Hurst for a local board member; drove the car for the first time this evening, and the new shifter feels very good. The effort is not high, and trip between gears is very short.
Perhaps it was the combination of brand-new OE engine mounts, and an aftermarket urethane xmsn mount, but the Hurst shifter was hitting the bottom of the trans tunnel, making it difficult to engage 5th/6th and impossible to get reverse. I had to cut a notch to clear the lever. For details, see:
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There is a difference between a shorter rod and a short throw shifter. A rod shortens the height of the shifter, reducing travel minimally, but a short throw shifter kit reduces the travel by a larger percentage through mechanics within the shifter. I'm no physics guy, but I'm sure someone here could explain how the internals of a B&M or Hurst move differently over a stock shifter.
After installing the B&M, I agree with the statement about the SVS; the spring tension for 3rd and 4th are greater than they were with the stock unit.
What makes a true short shifter, is changing the ratio of movement above and below the pivot point. By raising the pivot point, effectively making the lever below the pivot longer, it takes a shorter throw above the pivot point to effect the same amount of movement below said point.
Whatever the percentage of travel is decreased, you can expect the same percentage in increased effort, as you've lost some mechanical advantage.
If anyone is complaining about notchy shifting, and thinks a short shift lever will help, it will only exagerate it more.