415HP from 318ci IS POSSABLE!!
But he has a $2,500.00 limit, and your cost is nearly double what he has to spend. Not saying that your combo wouldn't do it but there are cheaper ways to get the same results. Already been there done that, even if I charged him for a complete engine I personally don't see more than about $3,500.00 for the engine. If he wants I would sell him the engine that I have for that and it makes way more power than what hes looking for. And it's not a stroker it's a 318. But this is my personal opinion.