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FCR jetting for XR400

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I've got a stock 2001 XR400 and was wanting to install a spare FCR carb I have. I believe it's a 37 or 38 mm (whatever came stock on the early CRF250R before they went to 40mm). I'm at sea level and was wondering what pilot and main jet sizes to start with? I know I'll have to fine tune it but just was curious if anyone could suggest a starting point so the bike would at least start.
Also, it has a FMF silencer and a K&N filter. Stock header tubes.

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Was going to see how the 400 cables fit, but do have a quarter turn throttle and the cables off of the CRF250. Figure one or the other will work. Just hoping the air boot to the filter will fit the back of the FCR. Thanks for the jetting info. Will probably be later in the week before I get the chance to work on it.

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