Currently driving a 305 TPI z/28, mildly ported stock heads, exhaust work, ported runners, converted to ram air. I'm also in the process of building a 350 for the car, going with a streetable cam, nothing too severe as it's a DD, probably 2.02" heads, maybe smaller, not sure yet, stealth ram setup, headers, etc. What I need to know is how much power can I safely pump through my stock 700r4? It's got about 30,000 miles on a rebuild, I don't want to grenade it, so I'm just wondering whether or not I should go ahead and get a stronger transmission, or is the stock one safe? I'm shooting for ~300whp.

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700R4 will be fine, unless you do any dragging, and you actually hook up on launches. I wouldn't worry at all if you're only aiming for a 300 WHP daily driver. Then again, it wouldn't hurt to drop $1,495 into a Probuilt 700R4 that'll handle 475 horsepower, with a 1 year warranty. That is if you know you want to beat on the car sometimes, you know, actually use it.

It all depends on your intentions, and I'm pretty sure you know them.