bigmeat5242 - You will get plenty of smoke/flavor with very little wood. But you need to adjust for your tastes. On my very first butt in my newly acquired Cookshack (APR 2012), I totally ignored the instructions. I used one chunk of wood. When the smoke died I added another, then another, etc. The butt was over smoked, Pitch black, and extremely bitter. Threw it out. I decided to weigh the wood chunks and found I had used a total of 12 ounces. On my next butt (MAY 2012 when I took the photo), I played safe and used 2 ounces of wood. The results are at post 38 in the link below. The color reminded me of what I would get from my old offset stick burner. Really nice, but a tad light on the flavor. But it was very moist and good. And I gradually built up the wood weight to get the taste profile for the meat I am smoking.
A small dense chunk (tight cell structure like heartwood) may weigh as much as or more than a slightly larger yet less dense chunk of the same species whose cells are clearly a little more open. And the denser wood, close to being heart wood, will burn slower/smoke longer than one with more open cells. My theory and I am sticking with it.
As for flavor, and there are disagreements on this, I learned after that first butt by visiting many sites that meat will absorb smoke until it reaches about 140 degrees. After that, it just layers up on the outside because the meats cell structure has sealed up/glazed over. It is still flavor but it is not reaching the meat interior. The second link goes into a lot of detail on smoke. Worth reading.
As for modifying your smoker, I have read on the
Smokin-it site that some are using the
AMNPS with no problems, and no drilling of holes. In the first link, you will come across a poster with a SmokinTex 1400. Drilled additional holes which can be plugged when not needed. I have never seen the need. But each to his/her own desires. There are photos. Also worth reading.
Dave
http://www.smokingmeatforums.com/t/133283/smokintex-1400-owners-out-there-help-me-get-tbs
http://amazingribs.com/tips_and_technique/zen_of_wood.html