LOL, the guy building a $15K race engine, just because he wants to, could have more investments and financial resources than you will ever have....on what grounds do you make those opinions about the OP or others? You know nothing about their current financial status..?
For what reason are you attempting to enforce your thoughts with regards on when and where to put your money?
Like i said before, a guy who has a big mortgage on his neck and is struggling to get by will not pump his last savings, or loaned credit in his "10 sec pro street" car.
Even if he does, which is obviously not wise, it is up the person himself...
The question he asked is, what others would do with this engine he bought, so if you had the money to spend and the availability to do so, what would you build?
For a change, just GIVE YOUR OPINION on the question that was initially asked?