you've obviously done some homework. The numbers look fine to me and I kind of found something to confirm it too which I'll post at the end or my blather.
All looks kosher except the future looking possibility of a 280-290 degree cam. Me thinks too big for that motors CID and rod/stroke ratio.
I don't hate it, but then again, I don't love it either.
I have bias though, so, perhaps this won't mean much to anyone but me. Let me explain....
My first problem is that the motor is SERIOUSLY under-square. (bore-stroke ratio) I have a thing about square and under-square motors. I like a over-square motors to unshroud the valves more. Give'em room to breath. The smaller your cid, the more important I think this is because the you generally need more rpms to get the airflow for good power. The more CID you have, the more I feel like you can get away being square or under-square and still make good power/TQ.
One point of reference, close to what you're talking about, is the Pontiac 326 and 336. They have similar bore/stroke like your plan.
My next problem is somewhat related,....it's that rod/stroke ratio. I think that's the smallest ratio I've ever seen in a small block. It's in the area of normal BB ratios.
I'll shut up now. lol. All that being said, HECK YEAH it can be done, it'll work, and it will produce the numbers you suggested!!
If people are brave enough to chime in, this could really be a can-o-worms here.