How can i make 700 horse from a 410 stroker

You could just buy the engine Jack Barna built at Valley Performance in this thread. It’s just sitting in a corner at his shop I believe still.

Otherwise, you can do it with either INDY heads or W5 heads.
700 ish lift roller low-270’s @50, Indy intake, dome custom piston to get 13+ compression will get you there, once sorted.
A combo like like this(using w5 heads, my old car) just went 9.54 couple weeks ago at 3200+ pounds. Nothing exotic, just good machine work and nice parts.