How can i make 700 horse from a 410 stroker

I'm pretty sure the small block Victor heads will flow well enough for your goal.
But it seems like they are very expensive when you add the rockers ?
I'm surprised more people don't use them ?
Looking at the truck and the projected cost of a 700+ HP small block, I don't think an extra $1000-$1500 for a set of good rockers is going to crash the budget. If that thing is going to have to spin 7-8k rpm, you are looking at special springs and titanium valves ($$$) for whatever head they go in.