Can't say for sure, but I do believe you probably have GT40 iron heads on that engine. 270 horse with the E303 cam would probably be about right with GT40 irons on it. They out-flowed the stock heads and added about 25 hp or so, although there are a lot better heads out there now, they were still worth swapping out the stock heads for.
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66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"
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