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Out here in OZ, never seen a race car brazed. Mild steel roll cages are MIG'd in, Chrome Moly cages are generally TIG'd in. Galv is treated by flaming it with the Oxy torch till the spot is cherry red, doesn't lose all the galv, but makes it a damn sight easier to weld. Those worried about that heat affecting the metal...it's a race car people, Roll Cage welds don't get Ultrasonic testing, or even mag particle. The most thorough inspection it comes under is the scruitineer who may or may not know anything about welding.
If you're confident of your MIG skills, go for it. If you like Brazing...go for it. At the end of the day, you're the dude trying to drive it ten-tenths, so make sure you're happy with the process being used.
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