85 302 H.O. spark plug question

[bnichols04]

I just bought an 85 302 H.O. mustang engine from my friend and i have it all together but i can't find any sparkplugs that fit it. I bought the autolite 25's but they won't thread in. Does anybody know what plugs this engine gets????

 

[93 LX]

any of the peanut plugs will work. peanut plugs are the 5/8" not the 13/16" plugs. The number isnt as important as the physical size.