If you want to race a brushless in the stock class, try the Novak SS13.5 Brushless Motor. All the velocity motors are clearly modified. They will outperform any 19T.
The Super Sport SS4300 Racing Stock Brushless Motor will be close to a 19T. The Super Sport SS5800 Brushless Motor will generally outperform a 19T. You might find yourself being beat down a long straights with the Super Sport SS4300 by 19T brushed motors. The Super Sport SS4300 will have more tourque, so you gain the advantage in tight tracks. I've only seen all three of these (the Super Sport SS4300, 5800 and 19T Brushed) complete together on a med size asphault TC track. And the 5800 had better laps, almost every time. The 4300 and 19T are very close, but a big open layout favors the 19T over the 4300.
If you have never raced with a modified motor, I would recommend if you decide to go with the velocity, limit throttle EPA until you get used to racing with the velocities. Or, better yet, buy the SS4300 or SS13.5 brushless motors. And then get a lower turn motor when your skills are ready for it. Otherwise, be prepared to buy spare parts for your truck, if your skills need work.