SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
It will run a whole lot stronger if you go 12 lbs f/i or 150 shot. Don't know for how long though:p
You basically answered your own question with the mention of a fresh longblock. And unfortunately that's your best option. There is no snake oil, "engine rebuild in a can" available at Autozone I'm aware of that actually works as advertised.
As long as it's not already trashed and you take care of it and don't abuse it, I see no reason why you shouldn't be able to squeeze another 60-100K out of your engine before a rebuild is mandatory. On the other hand, if it's already burning or otherwise passing a significant amount of oil between changes then maybe a rebuild in the not too distant future is in the cards for you.
2001 GT Convertible
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4