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Hmm well I don't know how much different the 351m is compared to the 351w (compared to the 302w which is what I have. The 351w and 302w apparently aren't really much different at all).
I guess modifying a park of gaskets would be your best bet then with aftermarket stuff. Or you could get messy and just use "the right stuff" permatex gasket maker or just plain old permatex ultra black rtv. That would work, but would be messy..
The 351M is basically a Cleveland block with a Windsor crank in it. The little pegs I have are some kind of alignment pegs for something, next time I'll just cut the gasket to fit around them. I've gooped up black rtv all over the edges already so that will be a pain to clean.
That way if people read through this thread they can continue on my new thread! I gotta say, my Bronco surpassed XLT status into Eddie Bauer + status. I could even call it Eddie Pauerstroke (™) (okay it's not trademarked yet!)