The Ford Capri Laser Page

I took my 2.8i Auto off the road last year because it was overheating. I was advised by the technicians at work to change the head gaskets. I did this as well as strip down and overhaul the heads. Since I've put it all back together I have a strange problem. I have a misfire on number 2 & 4 cylinders. I thought that maybe I had put the distributor in 180 degrees out so I checked. This was indeed the case but rectifying this has not cured the misfire. I've checked the compressions and they are between 150 & 175psi on all cylinders. The plugs are all sparking o.k. Would you be kind enough to give me any clues as to where to go from here?

check inlet manifold gasket and carb base gasket maybe trapped or torn or old piece of gasket stuck on heads or manifold good luck