1974 Dodge Dart Sport rebuild

On to the intake. I have 4 choices,

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well actually 3 as the one on the far right is for my 340 Challenger (#3614025) but I have a second #3614025 that I think is older as the normal casting number is missing (or not it the usual spot). Here is that number.

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That one is the second from the right and looks like a metal beaver got to it.

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The next one, third from the right, is the one that was on the 360 when purchased (#4100340) which is for a 1979-1991 360, cast in 1974.

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The remaining one is from 1985 (#can't remember where that came from) and is also
number 4100340.
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Leaning toward the older (maybe older) #3614025 even with the very poor clearance job.
Less of the anti smog crap to contend with. The water ports are slightly different but they will fit all the A/C stuff without an issue. Not sure on the throttle linkage but I am sure something can be made if the linkage I have does not work.

Anyway, two questions: Anyone know what the stamped number 6291 or 5291 means? Thought it was the 10,000 day Calander but it doesn't seem to fit.

Second: Thoughts on putting an older 340 intake on a set of 1979 360 heads?

Thanks in advance

Ray