Gotta say it's a great learning experience and very gratifying building your own engine, if your into that sort of thing like me. I've been into muscle cars all of my adult life and finally built my own engine (intake to pan) last year (393w).
I'm fortunate enough to have a good buddy of mine, who has probably forgotten more about cars than I'll ever know, to help me out.
To the o.p if you really want to tackle building a stroker , assuming your a novice buy your questions, I would suggest doing a lot of research/reading, ask a lot of questions and find a good machine shop.
347 or 331 still a 302 block bored, crank stroke is longer on a 347 (more power).
H-beam rods stronger than I-beam, also more $
Figure out what size engine your building then pick heads/cam that will flow appropriately.
A lot of consideration and options need planned out don't rush into it, helps to know someone with more experience.
Like mentioned above you could always contact Woody @ fordstrokers and make it simple.