You may want to consider a dual plug head. These came stock on the newer rangers. The newer rangers also had roller rockers from the factory. Doing the dual plug conversion from what I hear isn't very hard.
hope this helps,
94 Tbird LX
B&M Shift kit
More mods to come.
At first I worked on out of necesity(because I had no money)
Now I work on cars out of obsession
(and I still don't have any money)