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Get metal bushings, a bearing spring guide, a sorbo pad, and the correct spring. You can upgrade a TM to high 300s without an issue. However, be aware that while the sorbo pad will help cushion and protect your mechbox, you still run a good risk of cracking the mechbox prematurely.
As for velocity, I say if you can hit 350-ish with a TM, you're doing pretty well and it doesn't need to go beyond that, at least from the mechbox perspective. Get a spring that will push 340-350. Then add a tighbore barreland you add 20-25 fps to that. And that will keep your mechbox safe.
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