Question about lift and coils

I have a 4 inch lift in the front of my cherokee that consist of trailmaster 4" coils, rubicon express upper and lower control arms for there 4.5" lift. I have someone that wants to trade me a brand new set of 6.5" coils for my four year old 4" coils. How bad of a bind would I put my control arms in by putting the 6.5" ones in. I have intentions of in a month or two buying the Rustys long arm upgrade. I recently redone my rear suspension and its sitting at 6.5-7" of lift and it looks funny now with the nose sitting down.

You would be off by about 1/4" length on your arms, meaning your wheelbase, caster and pinion angle would cause vibes and wandering, but it will work.

Even running the CV front shaft that 1/4" would cause vibes. I have JKS Quick discos that I think I can extend to work with the 6.5" springs. Another quick question I want to find out exactly how much lift I am running in the rear you wouldnt happen to have a measurement from the ground to the bottom of the unibody at the front spring perch with 33" tires would you? My rear fenders are cut so I can't measure there.

Well I installed the 6.5" coild springs tonight. I have intentions of getting the long arm kit soon or atleast another set of control arms till I can afford the long arms.