I've got a '69 Model J that came with a 370 HP 428. They're good engines. If it's a 428 in a '69 GP, it's got four bolt mains.
The "standard" engine for Model Js were 400s but you could get a 428 in a Model J.
69GPModJ
Moderation in everything--including moderation. WC Fields.
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69GPModJ
Moderation in everything--including moderation. WC Fields.
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