418 Stroker options....

I know what I can do, but I am more interested in peoples personal experiences like would it be better to sleeve the two to 40 over or just go 60 over? how much is sonic testing? how long will the cylinder walls last before they wear out? if it takes only a couple years then I guess I should go with 40 over ? which option would you go with ? and why?

but the big question is what route to take to get to over the 500HP mark? is the 340 the right block for the task or just jump over to the 400 and do a 498 stroker? I would be happy as can be if I could get close to the 600HP mark, Blower or NA?