[Halon]

That doesn't seem like it'd be that aggressive of a cam. However there is no black and white answer to whether or not you need or don't need to upgrade springs. Just have to measure out the risk and decide for yourself if it's worth it or not.

So just think through it. These cams, while not overly aggressive, are still more aggressive than factory, so they're going to be a little harder on the factory springs. They can probably take it, but how many miles are on these springs, how many of those miles are with the more aggressive cams? If this was a head with 50k miles on it, I'd probably just keep the stockers in and not rev it to the moon. However if you're talking a head with 100k+ miles, 20k of those are with the more aggressive cams, well then you're risk of inducing some sort of failure is going to start increasing.

From what I gather, you're on a tight budget. Beehives are great, but for your goals and what seems to be a tight budget, I'd just go with a single spring upgrade like Crowers. They are very affordable and should perform well enough for a mild cam setup like you have. That is probably what I'd personally do if I were in your shoes.

Or just stick with the stockers, but understand there's some risk involved, especially if the springs are in unknown condition/high milage. If you're willing to take that risk in an effort to conserve some money, that's your call. You may end up being completely fine, or you may end up floating a valve.