I need some schooling on Gen 3 Hemis differences. Power v Reliabilty v $$$ v Fitting into a '68 barracuda fastback

The eBay link is 1000hp

at $12500 more than the one I have making 900 and turning down to 860, that gives me alot of room to grow when the next version makes 1100 :p. These online sellers and their "Mopar Markups" are ridiculous. I'm going to keep vertically integrating ours until until it's literally the same, or less than our comparable LS engines.