Thanks!!!!! I was planning to do the same, just didn't know where to get one of those at. I'm not sure I'd want to do a cam/spring upgrade if I had to take the heads out.
Supposidly it is still a very tedious job with the tool especially on the last springs toward the firewall. But the way I look at it, I am going to do it once and 8-10hrs of work for a few years of enjoyment is fine with me.
Word of advice before you start the swap. Before you begin using that spring compressor tool, take a file or a small grinder to the inside "U" portion that will sit on top of the retainer. Reason being is that I will sometimes catch on the retaining locks and prevent you from pushing the spring down, and it will get in the way of installing the locks once you have the new spring installed. A little extra clearance there will help a lot.
If you are using comp cams USE the recommended springs to save yourself a headache and engine damage.
They wouldnt recommend valve springs if they didnt need them.Ive have the first set of modular cams they made along with their springs.12k miles with no issues.
Going a different way than what they recommend can only lead to trouble.