Vaccume is in the green on the guage. Wires are good/no miss at idle and goes good in first and second. starts backfiring when it has to work a little harder because of the taller gears in third.
not hearing any lifter noise and I think tht would show up on the vaccume gage(?) and cause a miss.
Could be timing related possibly... Not sure where it should be set at with this set up.