Blowin' Smoke! Please Help

when its cold if I push on the gas a little to much it bogs really bad, and stops once its warm. other than just setting the idle screws and timing i just bolted it on to the engine. my engine is the 318 build from an engine master magazine build. its the 318 with 360 heads with keith black pistons, except i used the 275 DEH comp cam and eagle rods. the plugs are a dark gray, however, when I checked them I noticed my number 8 cylinder look a little more "wet" compared to the rest. being worried i might have a bad ring seal in that cylinder i checked the compression but all cylinders read the same, right at 145. Thanks. Kory