It’s Winter. Let’s discuss strokers. How much faster

If your building a stroker, better heads and more camshaft should be part of the equation. That's just common sense. Just putting more stroke in, without enough peripherals to feed it, is a waste of time and money. I wouldn't expect to see a huge improvement. Same applies to a 90% effort race motor, that is already using major power producing parts, comp ratios, heads and cams.
Which do you think will run better, an oval port 396....or a big port 496?