Slant 6 talk; My first post

Hello everyone!
Had a girlfriend a few years back who had a 68 Dart conv. and always loved her car. Always told myself "Man, I want to get my hands on a Mopar!" Almost scored a 71 Demon with a /6 a few years back. But I was about to move so it just wasn't practical(like owning a 40 year old car would be anyway). So to make a long story short...after a long time looking on craigslist; I finally got my 71 Demon with a /6. Saw it on craigslist, 30 minutes after the guy posted it. He told me it needed to be completely restored. "No problemo!" I thought. I have an old car already(76 vette). So I went to look at it the next day. It had been sitting in a storage unit since 1996(a real "barn" find). So the body was almost completely rust-free. All original with 102K on the odometer. I had my work cut out, but I was ready. The guy sold me the car, a V8 K-member, front disk brakes, a 440, a 727, and a couple misc parts for $2500(what a steal, right?). Brakes were practically nonexistent(literally). Took me a week to get it running, just to find out the a-904 was no good. Took it out and got it rebuilt, and put it back in. Finally was able to take it on a real test drive. Went to test the kick-down on the new tranny...well; it worked! Kicked down so hard it spun a bearing and toasted the engine. And now the car is sitting engineless and prep'ed for its new /6! Thats got me all caught up on the background.
So the real question is...are these slant 6's as cool as everyone is saying? Because its not what the car is now(I NEED to keep the 6 for a daily driver so my mpg's aren't crap...for now). But later on, when the car is being torn down and rebuilt(after the vette is), what do I do? I have a slant 6, a 440ci b/b, and a 5.7L hemi out of a 300C(threw a rod through the pan; got it for so cheap I HAD to buy it just to hold onto). Obviously the hemi would be bad-***! It has all the fuel injection crap still on it so the options are there. But its expensive...REALLY expensive, to put that engine in my car. The 440 would be great...for a drag car. But its so heavy and big, i feel like I'd be just spinnin' my wheels(excuse the pun). So I come back to the /6...Whats the deal with these things? I've already read some forums on here about how to make go. But just how sweet is the /6?? I already had a great idea to make a "SRT6" out of my car...but I would like some input.