UNLESS YOU HAVE BEEN UNDER A ROCK since 2003, you are surely aware that the third generation Hemi engine has been the mainstay of Mopar performance (or even work or people-mover) vehicles from that datum. That's 20 years* of 3G Hemis, boys and girls. The junkyards are overflowing with ‘em, and a clean Hemi is now far easier to find that a smallblock, which, even in SMPI Magnum form, went the way of the Dodo Bird when the last vehicle it was used in, the bulletproof B-van, was killed off (thanks, Mercedes) in mid-2003. The ‘09-up 5.7s are dirt common, and are far superior to the mill's earlier incarnations (Apache cylinder heads; VVT). The “SRT” 6.1 L (2005-'10) was a ripper, but never a volume production engine. The 2011 update,…