small block ford, edelbrock performer intake, just a run about pickup.

anyway, got most all the lil kinks worked out with the truck but I noticed that the driverside bank runs 500degree egts for each cylinder.
Pass side runs 700 on average.

Jets are matched, engine runs and drives perfect. If it was one cylinder I'd think it was valve leakage.... plugs are all gapped the same and in good condition.
The carb appears to be functioning well, but why would the pass side be leaning out? Manifold air draw perhaps? Manifold vacuum is 18inch so no air leaks that I know of.


Any suggestions appreciated!
Thanks folks.
Drew