there's a lot to unpack in those pdfs. you're aiming for mid to upper 400bhp...many folks aiming for the 500bhp neighborhood end up over building for their current goal in case there is the desire for more power one day in the future. the "I want to see 450 so I'll have it built for 550" idea. and the build it for 700bhp because it will live at mid-500's and I won't have to worry about anything, including detonation with a great tune. at 710 with detonation, it becomes scrap.
that concept was a heck of a lot easier to do in 2019 and earlier years. currently, there are long lead times for parts. some of our best known Buick builders are more than a year out with back log. and roller cam blanks - some have been waiting since 2020 for their cam.
besides the long lead times and shortage of parts, cost of parts and labor for a forged rotating assembly, roller cam, maybe roller valvetrain, and machine work to block, main caps, heads, forged crank add'l machining +mallory metal, etc. have like doubled vs just a few years ago in 2019 and earlier.
with the above in mind, read through this thread below. there's spot-on input from bison, turbodave231, and Scooby. perhaps no need to overbuild if you just stay at your goal of mid-400bhp and enjoy the ride.
Looking for advice on my buildup I am considering doing, I am trying to build an engine out of a bunch of parts as cheap as possible to get my GN back on the road again. Then I can pull my engine that is in the car and Very tired and do a nice forged roller motor. My goals for this first...