Sounds like a lot of octave fuzz. Maybe Ibanez Standard Fuzz.
I can get halfway there with my Zvex Octane 3 clone, but here's a great pedal for those wacky El Camino sounds... it's basically an Ibanez Standard Fuzz clone.
http://www.solidgoldfx.com/pedals.php?pedal=Formula76
Check out this demo video - the playing is not the best but you can hear some Keys riffage in there and if you use your imagination...
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