1986 Honda Civic 4WD Wagon with carberated 1500 engine. Engine loses power after a short time at high power output like on the freeway going up hill or lower speeds on steep hills. After pulling over on the freeway and stopping for a minute or so it will accelerate like normal until getting up to 60 or 70 miles per hour then starts to slow down again. On normal around town driving with part throtle it runs good. I seemed like it may have been leaning out so I checked fuel pressure and flow, dirt in the float bowl, plugged needle and seat, added an electric fuel pump in series, checked timing. checked cam timing, disconnected the vacuum advance, disconnected the vacuum to the EGR valve, checked for vacuum leak, disconnected the vacuum hose the the carb secondaries, disconnected the oxygen sensor. I forgot to mention at the start that this all started after replacing a broken cam shaft, the compression is down to 90 or so psi in one cylinder so on valve may be slightly bent, the other cylinders have over 160 psi. The spark plugs have always been very clean with white insulators, always looked like it is running lean. The carb bowl vent valve is opening ok. Any help would be appreciated. Thanks. Paul