I've heard that also but I think today's new wires are a lot more insulated than the wires of yesteryear. Mine are zip stripped together also with no problems.I had a fellow Club member tell me it was a big no no to have spark plug wires tyrapped together (Like 72Fastbacks). Something like it may allow cross transients that affect how it runs? Has anybody else heard anything like that being an issue?
That being said, your under hood is awesome 72FB...