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1. only 69-73 heads are in play.
2. you must take out the Thermactor bumps. This can be done at home but you will eat a lot of iron filings before you finish ::
3. you need to mill or otherwise get your CR back up to snuff. A straight swap will otherwise cost you about a point in compression.

Bottom line, before there were scads of aftermaket Windsor heads, this was about the only game in town for 302s. Now that everybody and his cousin makes cheap aftermarket heads, its not worth the trouble unless they are free or close to it, and you grind them yourself. Today there r several good aftermarket iron heads that wont cost anymore than prepping the 351s and fall right on your motor.
 
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