Glad I can help...so far what we have heard in my truck in the first few days (I have another guy who is an expert in sound systems) seems to be pretty positive. I was really doing the truck and the sound system was going to be a novelty because from a competition standpoint (if I ever get to compete) trucks are much harder to work with because you can not equalize the path lengths from the left side speakers and the right side.
However, with a bit of time alignment and being able to leave the cowl vents open, I was able to go from a 5 1/4" driver to a 6 1/2" driver. The guy who is working with me and who heard my Acura Legend competition system told me that what we had done so far in a few days was the best sound system he had ever heard anywhere and the attack of the mid bass was phenomenal. You can really feel it hit you in the chest at moderate levels and that's with an 80hz crossover at 12db. Coming from him...I was a bit surprised but our older trucks may be a hidden gem!
As an aside...if you are looking for great sound in your truck, NEVER try to shoehorn a 6 1/2" driver into a SEALED kickpod. It will not work...ever!!! I have seen tons of guys try to get around this by cutting out the back of the kick pod to let the 6 1/2" driver breath...but that rarely works and is a band aid. That is why doors tend to work better than sealed kickpods for midbass impact...airspace!
However, these trucks are phenomenal because of the cowl vent openings.
In fact...before I forget...here is a really great link on car audio from a guy that has won several national competitions and one that I have studied extensively...there's even an item in there that talks about what brands are good...and which ones are not so good...lots of good stuff.
And IMHO...this is the single best information about audio that you will find anywhere for audio and for our trucks...
http://www.glasswolf.net/papers/index.html
Buzz down his page to the section "Speakers"...this is good starting point on acoustics and speaker placement. Then there is his "The Good, The Bad and the Ugly" where he gives his opinions on brands. Pretty interesting and brutal!
I'll post my kickpod builds on here in the next few days as the ones I have seen here from previous posters...are way too hard to build and build correctly for GREAT sound. I've got a couple of ideas I'll pass along...specifically for our 60-66 trucks.