Your solution is to run 'shorty' plugs. They are about 3/8 of an inch shorter and make a huge difference. Also, you can run spark plug wire protectors. They are small asbestos sleeves that slide over the wire. This is a very common problem. You should have no problem finding the short spark plugs and sleeves.
My solution to everything, " Get a bigger hammer or bigger bullets".
1982 Z28 , 350 bored .040 over, Vortec heads, .469 cam
Headers, Holley 670 carb
3.73 posi rear end
12" subs that are WAY to loud for a guy my age to be bumpin' with.....