Need some opinions on where to go from here...

What intake, carb and distributor? One thing to check is the distributor cap and distributor. 3 & 4 are next to each other on the firing order They don't look like they are firing. 1,8,4,3,6,5,7,2 , That is the only thing that links those two cylinders. If its a dual plain intake they are not on the same runner level so ignition spark ties them together. Cracked Cap?