I had a 302 built with roush 180 heads for my 70. I bolted on a set of hooker headers and I put the plugs in and dont have any clearance. Some of the plugs I cant get a socket on and none have enough room for wires. I have talked on the phone to eveyone and cant get any answers. Somebody out there had to have put a set of roush 180 or windsor jr heads on an early mustang and ran in to this problem. I would appreciate any input.

 

They make special spark plugs for that. I havent used them but need to my plugs are kinda stuck.
http://www.jcwhitney.com/autoparts/P...001622/c-10101

you can do a search for header spark plugs.