What makes you think all he can get is 200 hp?
The question is depends how/if the OP goes about it idle-3000 rpm (streetability) could be pretty compromised and is that ok with him or not? If that ain't a huge concern then it's a moot point, next also depends how he goes about it, it can cost more especially piston wise if that's also ok with him then it's really no big deal to build one. If it is an issue then it might/probably be a problem depend how he goes about it.