There are images of that stuff on the web. Most of it was shown in magazines back in the day. Gentillozi and a couple of others were changing the lifter bank angle back in the day. McCandless maybe was another.
With today’s springs, pushrods and lifters you can do 8500 RPM RELATIVELY reliably on the 59 degree lifter bank angle.
Be prepared to do a ton of work to make real power that high and the valve train maintenance will keep two people pretty busy.
