I have a set on my 64'. they are not the prettiest but work well. The tubes go in individualy which makes instalation a snap. They are for a 351W swap but I put them on my 306 with 180cc Protopline heads with no problem other than having F15Falcon fab me up a new trans crossmember(mine wasn't stock anyway). I had to go with these due to my 1 5/8" supercomps would not allow the install of spark plugs with the new heads.