A friend of mine just bought a 67 Mustang fastback. The guy he bought it from says it's all original with a factory sunroof and a 429/4 speed. It is in need of restoration so I want to know what letter should be in the VIN for a 429. Any replies are appreciated.

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92 F150 4x4, 82 Fairmont Futura coupe, 78 Fairmont wagon project, 81 Merc Zephyr parts car, 90 F150 excab 2wd, 78 Dodge Ramcharger