Contact Chris at CKperformance and you'll be much happier in the end. If they're not a vendor or a member stay away. It will save you more money and aggrivation in the end.
in the 86gn. I have no complaints, it worked well until the tv cable slipped. It was fair priced even w/shp'g. I purchased Chris' rebuild kit to make the repairs. I go w/the supporting vendors, especially since they have made great strides in the bullet-proofing/performance of the 200-4r.
Your HP level makes a big differance in your choice as well. I run Lonnies stage III for the 87 which is 600+hp as opposed to 400 on the 86.