Harmons for one,used to sell those back in the early 80's.I bought one of almost all the cid callouts they offered back then.
I ended up keeping the 402 Turbo Jet 400Hp for my own car after the engine was built..I didn't leave a gap as wide between the two,like is in that photo,but you could still see the overlap on mine & know it wasn't original.
Not to mention they never made a 400Hp 402 in 1972.
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