[Found!] Complete 273 Commando High-Performance Engine

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Does the year (65, 66 or 67) matter
If the OP is trying to be date correct then yes but if the OP doesn't care the OP should stay away from 65 as the intake and heads use a one year only (maybe 2) bolt pattern.

The 66 and later motors use the more common design that is consistent with most intakes you could buy today.
 
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