Stroker timing changes ?

The chamber design in the head and the shape of the top of piston are the two main contributing factors to what the engine will want for timing on WOT. You’re going to make peak torque (max VE) at a much lower RPM than before if you didn’t add a bunch of camshaft so your curve will want less advance at the new peak TQ rpm. I’ll render a guess that your all in timing will be similar, maybe 1-2 degrees less than before for max power, and it’ll want 3-4 deg less in the curve around peak torque. All other points in the curve will be about the same. Idle timing likely won’t change much, again if you didn’t change the cam it might not change at all.