200c to 200r4 swap with a 3.8 v6 tv cable

There are some aftermarket universal cables that work for both transmissions. Not sure about the OE cables being interchangeable. Whatever bracket you have for the carb should work with either cable. The speedo cable will work. I think the speedo gears are different.
On a side note, I don't think your 3.8 is going to like the overdrive. Are you planning a gearing and/or engine upgrade soon?

If you pull it up tight, you will cause a leak. Ask me how I know. I used washers on a couple of builds, worked well.

olds307 and 403 said:

If you pull it up tight, you will cause a leak. Ask me how I know. I used washers on a couple of builds, worked well.

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I don't know how much difference there is between the 200 & 200R4, but using washers doesn't sound right to me. If you do pull it up tight or have to force it, you can damage the internal pump on the trans - when I first (incorrecly) installed my 200r4 to the engine (350), there was a gap at first (where I used some lock washers between the trans bellhousing and engine block), because the torque converter wasn't seated all the way. The torque converter should click 3 times on the input shaft of the 200r4 before it's completely seated. When it's installed correctly, you should have minimal clearance between the TC & flexplate (the torque converter should spin freely, but when you tighten the TC to the flexplate it should not unseat the TC, there should be a 1/64 or 1/32" gap (which is a ballpark) but the point is the TC should not unseat when it's completely tightened up and torqued properly to the flexplate). This is just from my experience, feel free to correct me if you feel i'm wrong...
Not sure about the kick down cable....can you post a pic of the carb side?
Also, again, not too familiar with the 200c, but with the 200r4, I'd wire it up so you manually switch the OD on or off so your stock ECM doesn't go crazy (and also so you don't ruin your 200r4). There's a lot of info out there about manually wiring up a switch to activate in 4th gear. Sorry for the long post...I've done a lot of research on 200r4s...

olds307 and 403 said:

I used washers on a couple of builds, worked well.

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Me too. The key is to be sure the TC is seated into the pump (pushed to the rear of the car). The gap between the TC and flexplate varies from car to car. I've seen everything from 1/16" - 1/2". It's okay to use washers to fill in SOME of the gap. Just make sure the TC has a little room to "float" in the pump. If there is tension you'll burn up the pump. Remember, once everything starts spinning and heats up there will be expansion a you need to leave room to grow.
Can't help you with the exhaust hanger. You'll just have to figure something out.