[Formulajones]

If you just want to go to a simple track outing before things close out there, and have a little fun with the car, I'd run what ya got.
Being an automatic and a footbrake car you'll likely be just fine for a fun track day, I just wouldn't make a habit of it. Chances are the track won't have "radial" prep anyway, and if the suspension doesn't have some tricks you probably won't be cutting stellar 60 foot times anyway. Go have some fun. If you're already down for winter, then make the upgrade.

I've gone 11's in a pretty heavy car with 1310 joints and stock yokes, again in an automatic car and foot braking it. Never broke the shaft or anything related to it but I wasn't there every weekend pounding on the car either.
Funny, most of the stuff we've raced for years had stock driveshafts in them and never broke a driveshaft. Dad's GTO was running mid 11's since around 2000 with it's original 50 year old driveshaft and some greaseable u-joints in it, lol. Nice wheelies and 1.5 short times. Never broke. He has only recently went to a 1350 shaft good for 1000hp when he upgraded the engine. I did the same on my Chevelle when I swapped to a 4L80E, figured it was a good time to do it.

At some point you'll want to upgrade though. If for nothing else just piece of mind.

1350's with a stronger shaft make the most sense if you're going to spend the money and spend a lot of track time with the car. Upgraded yokes at the same time are part of that, and you'll never have to worry about it again.

Your question on 1330's, our local driveline shop builds a nice heavier steel shaft with 1330's and he gives it about a 600hp/tq rating. I run one of those in one of our street cars with a 5 speed in front of it. This particular car isn't at that power level, and even with the added stress of popping the clutch and horsing around with the car, I don't even worry about it.