Another look in the haynes book and it looks like the 2.0 intake ports are paired with the fuel pump in the center. Mine are evenly spaced with the pump between holes 1 and 2. I believe they are both 2.6 heads. My truck is a 79 and I thought I saw somewhere on here that they had some mid-year changes that first year. I'm in WA state, so I wouldn't rule out Canadian stuff, but it had the jet-valves, so probably not from there.