You can buy all the stroker stuff off the shelf.
You can get a 440 crank ground to fit a 383 like already mentioned or just buy one brand new.
Any size stroke from 3.750, 3.915, 4.150, 4.250.
Will fit a b- engine.
I think 438 is about all I'd go with the 383.
Bore size being my determining factor.
To be frank, I would just use a 400 block knowing I could use a 2.25" int valve without issue. lol cubes to the max if I wanted.
