Stroker Combo Questions

I currently have a set of heads and intake being ported as well as a matching roller cam. I'm having second thoughts about using it on my engine and am considering building a stroker engine to use these heads on.

So the question is really 2 parts;

1. B or RB?

2. If 440 do you go 510, 512, 528 or 543?

3. If a 400 do you go 451, 470, or 512?

and why would also be helpful.

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Some info I found in my research.

Basically we want a Rod to Stroke ratio of 1.55:1 or higher to reduce side loading force on the thrust side of the piston to minimize friction. This becomes more critical above 5500rpm.

Next we want a piston with better than 1.250 compression height, the distance from wrist pin centerline to piston top. If this is the case the 500ci B is a bad idea