If you want to do both, IMO, which is frequently wrong so don't swear by me, a max output build would probably net you the best results.
Often, an engine will perform best when it's built for the kind of racing you intend to use it for, but since the two kind of contradict each other in some respects, you'll find it hard to really have your cake and eat it too unless you just go for a maximum output build.
Your trans. is going to be really important to your setup, so you're aware.
There's enough chassis related modifications that you can do to help the car handle the high output of the engine and use it well to race from a dig, like a good front xmember, good suspension work etc... while allowing it to still perform well at WOT in higher gears etc.. That's why I'm suggesting max output instead of purpose built, it's the only way (that I can see) to really have a lot of available power all of the time for your needs. I think focused chassis design will facilitate the "purpose built" aspects of what you need, like handling a high powered launch, or being able to withstand cross winds on the highway, or being able to take a corner hard and not making sooo much power you can't grip etc...