The 1200's were made up till 74 and the 180bs were being pumped out in 74 so what would the big deal be. There from the same era.The only issue should be stopping power, Structural safety. etc.We put CA motors in these things with no hassles and there getting you to right essays regarding an engine conversion. Find another engineer mate Someone is pulling ya leg. Hope he's not your uncle or something. thats just wrong bud.