Well, I kinda feel dumb now. It's one of those things you always read, and you just look at it, looks good, must be good.
Bad ground somewhere. I took off all the ground straps, and the battery cables, and got everything to nice bare metal. Terminals too. What do ya know, it turned over. Seems I've learned, once again, to always check the basics first.
On the bright side, I heard it turn over for the first time today! It sure did put a grin on my face!