What goodies do I need to build a Fast slant 6

no doubt, but the point of the reference was it can be done and doesn't need to be tig welded stainless etc. hell, could be done with mostly junkyard parts. Street racers do this kind of stuff all the time. A lot of them take it as a personal challenge to do it on the cheap of simply have no choice.

Improvise, Adapt and Overcome.. :)
I blew the bottom end out on a couple of slants when I ran over 5000 rpm
Got one with a steel crank and I was ✅
Done