Who thinks I'm crazy?

6000? you can twist a 383 way more than that.

Anyway, back to the question at hand. When I was planning the Duster buildup I already had a 500 horse 440 and of course the 340 that came in the Duster. I had a complete 400 buildable core as well. I reasoned that an aluminum headed low block would probably be close to an iron headed small block in weight But I looked at a lot of big block a bodies and decided that the small block just fit so much better, was easier to work on and an aluminum headed small block would be even lighter. Then someone told me I couldn't run 10's with a small block Mopar so I had to prove them wrong, right? :) That was 17 years ago though when there wasn't a lot of small block stuff like there is now.

So now I'm firmly entrenched in the small block and wouldn't consider a big block at this point, you'll have to decide for yourself what is best though. There is a lot of good big block stuff out there now too, it's a tough choice, good luck.