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?