No, self aligning are 100% fine to use, as long as you don't have clearance problems. You just need to check.
it's really not about better/safer, just you need to use all the right parts. There are advantages to the NSA such as lighter valve train, but on a basically stock motor you're not going to see any real advantage by switching.
Sorry, maybe I'm not being clear about why I got into the SA vrs NSA rockers..
Since you already have the cam and rockers, you really just need to select the valve springs/retainers that will work with the parts you already have. And your original post about using beehive springs
BUT with the correct LT1 retainers would not work. Which is why I suggested different springs. And the economic hardened pushrods are a nice upgrade while installing the other parts.
BUT, If you do want to run the beehive springs, then you MUST change to the NSA rockers, guideplate and hardened pushrods, but in this case I would use the higher grade (and more expensive) pushrod.
Here the link to the full cam install if you want to look at other part numbers etc. My only suggestion is to use the proper hub install tool, our's was a few hundered miles away! One day I'll find time to document all the steps, bolt sizes and torque specs! This is how I found out beehives and SA rockers don't mix on an LT1.
http://www.97transam.com/97ta-cam.php