Doubt it - leaf springs are probably too stiff to fully flex without a wheel coming off the ground. Maybe some rubbing at full steering lock and flexed. Those flares allow more wheelwell room than narrow track fsj's - but even 6" on a narrow track isn't neccesary for regular wheeling. It depends on what you want to do with it.
My wag has 6" total of lift (4 spring/2 body) and I have 33's. My shocks only travel about a few inches either way from neutral when flexing, even though they're 27 to 29" long extended and have like 13" of travel. It's just too stiff to flex more than that. I think you'll be fine unless you want to wheel it way more extreme, and then you'll probably want to remove some leafs or get lighter packs.
My vote is go with it untill you rub, unless you want to lift it for looks, then 4" will be plenty and cheaper than 6". Too tall and you've gotta lengthen diveshafts, etc..
BTW, nice lookin truck - I
LOVE those wheels!!!!