Anybody Got Any Experience With These Cats?

Everything is listed as having Magnum heads the LA's and the Magnum long blocks. The LA's are listed as roller block and I don't believe that they have so many of those roller blocks just laying around so I'm assuming their Magnum short block as well.
I see where 6350 get you a 360 but 6650 gets you a 408... only a $300 difference.
I also see on these $6,500 long blocks that if you just got it has a short block @$2900 ..I guess the heads intake and rocker arms are what costs $3500+ more...?lmao

Seems a little out there, but then again its 2021 and we are playing with vintage 50 yr old toys

I thought I linked to the 512 big block crate engine.