just rebuilt 318 is missing

85 truck has a 76 car 318 with #302 heads which are egr designed , bored .04 over, 4bbl egr free intake, 500 carb, everything is new or reman, besides the distributor (off th 85 motor which had the same heads) , water pump and exhaust manifolds. It has about 100 miles on the rebuild, first i put the origional 1985 intake and carb on it, and didn't get the timing set to 12 degrees btc, like it says under the hood, so i was driving it retarded for about 50 miles, to top it off i had full manifold vacum going to the advance. it was a mistake, started dying after stoping from over 40 or so, i went with the 4bbl egr free intake and 500 carb to hopefully fix it. took the plugs out and they looked great still replaced them, set the timing to 12 btc at around 700 rpms with the vacum advance unpluged, and hooked it up to venturi (timed vacum) i tried full vac. again but it seemed to miss more. it idles so nice now, but it misses while cruising,hardly ever misses when i punch it even up to 80 but i easy on the gas at higher rpms it misses and gets worse. new plugs .035 gap. new plug wires, distributor cap and rotor, 160 psi give or take a few on all cylinders. accedently did the comprssion test with the throttle closed but i dnt think it would throw it off, plugs 4, and 6 usually seem lean, pretty sure there isnt a vacum leak. oh yeah it starts easy, doesn't tick or knock that i can hear. help me out here
Author: will d