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How does it run now? If it runs pretty good then I wouldn't see a huge problem with it, but you would have to have a good tune. What I would do is go ahead and get a new shortblock then supercharge after that.
Well I am the 3rd owner, but the other owners took great care of it and I've had absolutely no problems at all with it. Everything runs just fine, just a lot of miles thats all, still going strong though. Would getting forged internals be less pricey and safer than getting a whole new shortblock?
its not too hard to find another 4.6 block around for less than 300, you could build that on the side so that you can still drive your car around with its current motor.
nothing wrong with adding the blower just get a "SAFE" tune as apposed to a good tune(lol I know what you guys ment by good im just messing with ya)but what fryguy said was a great idea too...choice is yours
why is 100000 miles so damn much to everybody? lol anything over 80 grand n everyones like OMG!!!! as long as u take care of ur car n dont rag it out theres no big deal.