Save for a port and polish and new injectors. New injectors alone are worth the coin. TB spacer is just another way for someone to make money off of nothing. You can also buy a bored TB that gives pretty nice response.
Even a intake with an open filter is a bit of a waste of money. All it's doing is suckin in hot air under the hood. I say put money where it counts and actually makes a difference.
So if you have a oil leak. Fix that first. Then modify. I'm sure those 3 O rings on the oil filter adapter are leaking. That's a cheap fix. Just my .