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The A and the C were the same internally, except for the camshaft. I am not sure but I believe the heads were the same. The C used a dual-plane 2V manifold, the A a 4V. The K code was basically the same block as an A code, with some of the internal components beefed up, so it could handle higher RPMs to allow higher performance top end components like free-flow induction heads exclusive to the HiPo. The K utilized a solid lifter cam where the A and C code engines hydraulic cam. A "true' GT only has an A or K code 289. I must confess, even though my 289 is bad to the bone now, it began life as a C.

1966 GT Convertible
1969 Sportsroof (which is For Sale, by the way)
 
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I agree with Charles. A-codes are more desirable, all things being equal, but I would pick a nicer c-code in a heartbeat over a weaker a-code.

Cecil Bozarth

1966 GT Coupe (Tahoe Turquoise with black pony interior)

1994 GT Convertible
 

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I got the info from one of my Mustang Restoration Guide books - it has alot of engine info.

1966 GT Convertible
1969 Sportsroof (which is For Sale, by the way)
 
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