won't start - out of ideas

[littlja]

i have a 1980 k10 350 w/ HEI

Problem = i turn the key and the starter is not engaging - what i mean is, I have juice, headlights come on, turn the key a bit and the blower fan kicks on, choke light on the dash but nothing happens at the starter. no clicking, no noise, nothing.

I have replaced the starter with the same result.

So I replaced all battery cables and cable from the battery to the starter - same result

so i cut my 3 wires going down to the starter from the firewall and ran all new ones to ensure there are no fusible links between - same result

(btw each time i turn the key it I try it with each of my good batteries (tested) and each of my starters (original and new) one at a time)

I have also pulled apart the HEI and taken the iginition module in to vato-zone for testing - tested good

I dont really know where to go next - any suggestions - please help me get my baby going again