383 in 68 Dodge Dart? new build

Thanks moparsegura

Would you recommend I find a used one or am I better off to get something like a Blueprint Crate Enigne?

http://www.blueprintengines.com/index.php/chrysler-408-bpc4082ct/636

I found a 360 and 727 for $650 bucks on craglist but wasn't sure if Iwould spend about the same amount of money getting it up to par.