LS3 Computer or electrical problem?

[sp68cvert]

I had a builder install a painless wiring package and blueprint LS3 into my 68 Camaro. The cars starts for a while and then it won't start at all and my odometer will display different functions, Qtr. mile, trip A and B, etc. You can hear the fuel pump running when you turn the key., but the starter doesn't engage. I have tried to take it back to the builder and nothing changes. I have taken it to another shop that has experience with LS's and they said that it was programmed incorrectly, but I am having the same issue. It maybe the wiring as I disconnected the battery to have it tested and when I brought it back and installed it, the car started up with the correct odometer reading. Any suggestions?