Get some of these magnetic spark plug sockets from matco. I was able to get to all of mine on my 96 with a 460, if i remember, i had to get under the truck to get good leverage on #4 and #8. I also broke the #3 plug off in the head, had to pay a good mechanic $300 to drill and run a tap and clean out the cylinder, but he was able to do it in place after i cut the inner fender well out of the way.