I think the dilemma lies in the instance where, it's so easy to build a 500+ci BBM nowadays. $2,500 for a 4.25" rotating assembly!! Awesome !!... then you wind up having to squeeze all that air through a standard port head, which is already undersized on a factory 440. Further hindering your RPM potential. Finding a top end assembly that will support those cubes and not cost 2-3x what the rotating assembly did.... does not exist. I guess you just gotta pay to play in the BBM market.

If you upgraded your 500ci build to TF270's you're over 6k when you're done.

Heads : $1,500 each
4500 Intake : $ 500
4500 carb : $1,000
Recommend Harland Sharp Rockers : $ 1,400
Pushrods- $ 150 Valley plate - $150

Already at $6,200 in parts. You might need new headers depending on your chassis.. another $1,000...
And this is just for the Trick Flow stuff.. considered budget vs what you would spend on a B1 or Indy setup. But then you're talking aftermarket block at that point.

Idk.. guess I just need to be happy with my home ported Promaxx knockoffs on my 505. Lol.. it runs good and I have fun. But will never be comparable power wise vs a similarly built BBC. Unless I mortgage the house.