Lee,
I answered in the KDX room, and after reading your post here with more info, I have some more thoughts.
First question, is- how much have you ridden the KDX? Compared to the Husky, it's gonna be a real pooch. That in itself can be a major adjustment. You may not like the KDX unless it was burning nitro.
Second, how tall are you? From what I've seen, the shorter guys seem to do better on the KDX than us taller spouts. If you're tall, get some taller bars and the tall seat foam.... actually, just get the seat foam right away, a heavier guy like yourself will smash the stock stuff quickly. (not being a smartguy; the stock foam is squish stuff and flabs out quickly for everyone except those lightweights who stand all the time.)
But, if you were to keep the KDX, I'd take things in a couple of steps. First, a guy your weight MUST have stiffer fork springs; about 5 sizes stiffer! The stockers are good for someone in the 140# range, but the stock rear spring is good for a 190# person. You'd want both springs. While you're in the fork, max the oil height and go to 7wt. The next thing to spend on, is to get a RaceTech kit for the forks. (or WER, or MX Tech makes them, too). About $120-140. They aren't really very hard to install, once you have the nifty damper rod holder tool (like I drew up for the Just KDX room). With those changes, the KDX would be a whole bunch better, and should be good enough to get you rolling pretty good. Last, round up a T or R pipe with the stock carb + stock silencer and let it buck. (rejet & drill out the airbox lid = free.) The bike will be well on its way, and will give you a feel for whether you like the bike enough to go further.
Another avenue to consider- Enduro-ize the Husky. See if you can get a flywheel weight, perhaps a different pipe, and suspension work. (is it the MX or enduro version? I'm completely in the dark about Huskys.)