del sol no spark help!!!!

im working on this del sol for a co-worker it had a hole bburned through a valve on cly#3 i reoved the head had it machined and new valves installed, i reinstalled the head tested the compresion it has 180 across all 4 clynders went to start it and it has no spark what ccan be going on with this thing?

Check spark plugs, plug wires, and distributor. Also, is the timing belt on properly?

check dizzy