3.4L 1993 Camaro timing problems

I have recently rebuilt the upper end of my 93 camaro and I'm having what seems like timing problems. It runs extremely rough, and I have no pickup at all. Anyone have any problems like this before?

has it been scanned for codes? it sounds like an ignition problem. You may have pinched a wire harness somewhere related to the ignition system, or misrouted the sparkplug wires and one or more may have been burned.