There's a guy that has a mid-60's 1-ton G.M.C.,on "Youtube",with a "Twin-6 G.M.C. swap. looks like the hood is extended 2' longer than stock,to accomodate the powerplant. A lot of work,for what appears to be ,(in my opinion),a botched-up mess. check it out,and you'll see what I'm sayin'! Hope this helps.