If the only way for you to know if an engine can be built to perform is cause someone else did it first and you need a recipe to follow maybe you don't know much as you think you do.
There’s a bunch of people viewing these pages that don’t know and are reading up on how to do stuff. Not knowing is OK. Pretending to know, (Not you 273) is another thing. So, reading a recipe or doing a copy cat build (no shame there!) is a great way to get going faster.
I fully endorse anyone that isn’t sure on the route to take with there engine to copy someone else’s, follow a recipe from a book, or just have someone build it for them.
No shame, no harm, no foul.
Go get tinkering and build a beast, no matter what HP level you’re after. Simple rebuild? Go for it! Mild hop up? Go for it! Trying your hand at a street strip machine? Go for it!