As far as I know there is only one HEI wire set that fits that style of manifold, and it comes on trucks bigger than 1 ton with a 350.
If you order wires for a 76 GMC 6000 series truck with a 350 they will be long enough to use with your manifolds. I'm not sure they will be long enough to run through the engine mounts like the original plug wires do (at least they do on my 66 that uses the ram horn manifold like your 64). However, as far as I've seen that is the only tailored wire set made for HEI that will have wires long enough. The rest are made for manifolds that run under the plugs, or the log style manifold that is on the Malibus in the 80's and those wires will still be too short I think.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
75 - 80 Corvette wire sets work well also. they are long enough to route down and under like the stock ones. It's what I used on mine. I just made up my own separators and attached to the engine mount.
-- Edited by DANO65 on Monday 30th of July 2018 08:57:10 AM
