Don't bother going for any engine change if you're only after just over 200bhp mate - not worth it!
Using an ERST AMAL valve or similar you could have it setup to run high/low boost settings for normal driving and when you wanna take it for a ragging!
I would only bother looking into ZVH when aiming for 250bhp or more! 300bhp plus and you might as well start looking at ZT.
Me - I went for 1900CVH!
Cheers,
Andy