reinforced k frame - is it worth it

My two cents worth, yes it's worth doing, especially as it will be mostly bare while you work on everything else. It will improve your handling a bunch by taking the flex out of the K-frame. I'm doing the same thing in my car, and I bought the same kit from Firm Feel. I'm local to them and asked the guy to run me through where all the pieces go. I took photos, and reviewing them I think it's safe to say this would be impossible to do without pulling it out to weld it up. There are a lot of pieces and they go all over the place.

If you decide to go this route, send me a PM and I can email you the photos of what part goes where. They had a K-frame lying there he used for the photos. I'm not sure if there's a ton of difference or not, but my kit and photos are for a slant, not a V-8.