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This site should help you out:
http://www.classichemi.com/index1.shtml

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Okay, I found the number on the block, P27-166183.

However, it's still not turning up on any of the sites I've checked. Most simply say "P27" and acknowledge it was used on 2 engines, and that's it.

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According to the info on this page http://www.classichemi.com/index1.shtml , you have either a 241 or 259 Plymouth Poly. You may find it more helpful to change your search to those terms, I found some useful interchange info on this wikipedia page: http://en.wikipedia.org/wiki/Polyspheric.

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Well, narrowing it down to the right one between those two is what I've been trying to do. I guess I should have mentioned that. I have the service manual and it lists the 241 and 260 as being in the P27 models, but has no information on telling which one you have.

The sites I'm finding basically have the same thing, P-27 = 241 or 260 (259). I'm just at a loss as to how I find out which of the two I have.

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My point is that you could have either, as many of the parts are interchangeable. So knowing which block you have may be confusing, since the only part that you cannot swap out (and you don't know what the previous owner did) is the exhaust manifold. I would suggest hunting down a picture/# off the exhaust manifold (try google images) and using that as your guide, but be aware that your intake, heads, water pump and oil pan could be different.

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