I've done quite a few install on the 4l80. It is a stout trans. It's also a big unit. Doug's build shows how much trimming you have to do. Heck, in the Chevy builds, you are playing with some room issues. There's been some mention of lineage of these transmissions to their earlier GM counterparts, the T350, T400, and 200metric.
The 4l60/80 trannys are great units but do require a TCM. (Just used a FAST unit on one, I'm kinda loving it).
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How hard is it to incorporate the TCM into my Carbed sb?
It's not all that hard. You of course have your power and ground hook ups. (You got your stereo working, right?) There's a tach connection. A throttle position sensor (TPS) which you will have to hook up to the carb http://www.holley.com/HolleyNews/TPS Kit For Electric Choke Holley Carburetors.asp. And there is a brake light connection, which you can either wire in a relay or pick up a brake light switch for cruise control. That's it for the connections to the vehicle. The connections to the trans are pretty much plug in. The big pain with going the E version transmissions is the speedo. If you are using an aftermarket electric speedo, no problem. Want to keep the stock gauge, then you'll be talking to Shannon over at Redline.