Is a pistol grip shifter a good choice for power shifting/drag racing?

otherwise your brass blocker rings are the stops.
IMO, I think that is not 100% the whole story, as there is a stop-pin in the detent/interlock mechanism, that prevents over-travel to a large degree. I've depended on that since forever.
On another note;
With oversize rods, it's fairly easy to over-power the blockers anyway, when ramming the stick. But this might not be discovered until you street-slick-shift a couple of gears, and shorten your stick to like 7 or 8 inches. With the short stick of my Mr Gasket/Bang! Shifter, relocated about 10 inches to the rear, I have plenty of leverage for the 2-3 shift, driving it off the seat-back; so much so that the blocker rings might as well not be in there. But, I do use them for about 80/90 percent of the time when I'm driving normal.
I'll never go back to the factory spaghetti-rods. With the custom-length straight-tube rods that I was forced to fab up, missed shifts are now a thing of the far distant past.
The ball is, IMO, the only way to go; it has a near infinite number of grip-positions, and you can wear gloves, or even mitts in winter. . I loc-tited mine on, in about 2004, and it has never moved since.
I drilled a recess in mine and mounted a micro-switch in it, for my GVod that I use as a splitter. The switch signals a relay bypassing the computer, and this makes it shift like lightning.