I am constantly amazed at how much money is wasted on building stroker engines. Choose a target for the horsepower you want and build to that goal. As others have warned , you have a power limit on the roller cam block ( very safe) of 400-450 hp. Next look at the crankshaft. The amount of change in stroke is from 3.00 to 3.400 or .400 , which is "actually" only .200 ( less than a 1/4") because the crank moves the piston up .200 and down .200 for the total increase. This adds very little to the centrifugal force (or load) on the crank. It is still shorter stroke than a 351W( or C). A cast crank will not break in "normal" use . Journal accuracy is more important than the material in this case. I am not a fan of the 'SIR" or super cheap I beam rods as they are more "spindley" than a stock rod. "I" like the RPM nut and bolt , machined beam , double rib cap , economy rod , much better than the SIR or Scat "cheapie" rod even though they have cap screws. It is "my" preference only. Forged pistons are important and on "street" engines I suggest the 4032 high silicon , low expansion material. the pin in the wrist pin "issue" was a product of Probe's inability ( initially) to produce a "stable" piston . They did cure that situation and eventually made pistons "with" pins in the oil ring groove but kept the "myth" alive.
There is NO reason to put 700hp, 9,000 rpm components in a block with limited capabilities or power output. For those who use "insurance" as an excuse or reason , you 700hp capable parts will still be JUNK when your 450hp block fails , your extra money spent bought you nothing. IF your goal IS 700+ HP by all means buy the BEST parts you can afford starting with the block , forged crank , H beam rods , etc.
'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 44 years. Yes it is a real one.
'68.5 R code GT fastback
'67 Ranchero 408W -427 glass hood
'78 F350 "Oleynik" car hauler
Ford Experimental parts collector