My original set of Accel 8.8 wires had large boots on them and were slightly thicker wires. a few of them became casualties of the headers. I changed over to Taylor 8mm wires and they seem to clear the headers without any issues. Well, the wire looms help significantly as well..I have the old TES headers on my SBC. Only issues I had is to run spark plug heat sleeves and tight sparkplug access on some cylinders. They used to sell special telescoping sparkplug sockets for headers, which I have one of.