Looking at Shaker hood conversion....correct spec flat hood?

[Bondavi]

I'm looking at a '70 flat hood with pentastar in very nice shape for a Shaker conversion. For a car built later in the 1970 model year, what is the correct hood spec? How can I tell if it is a correct hood for mid '70 and not an early '70 or a 1971 hood? I know the later 70's had joint marks for crash protection, anything else I should be looking for?

[4Cruizn]

I'm not that Up to date on the Challenger stuff, some one will know! 

[Green Drop Top]

You have it covered, the tri-star and the crush zones are it