something bad wrong with my timing

i did plug both the carb, and the dizzys vac ports when checking it.

i am using the vac port on the front passenger side of the carb.

its a new rebuild with less than 500 miles. it worked fine before the mopar performance dizzy and orange ecu, so i doubt it skipped timing.

i think(and could be wrong) but a motor with a hot cam, and higher compresion than stock would need a little more than tdc base timing to run correctly.

i had it intialy at 22* base (i know to much but it was a mistake with the timing light.) it accelerated fine, but when i let off the gas it seemed like all 8 cyl would back fire one ofter the other trough the tail pipe. so i am thinking maybe my total timing is wrong. how do i set it?