I’ve explained it already.
Comparing what the OP wants to a FAST car is a bad example.
The OP has already said he likes his 4.56 gears.
What many are doing is trying to convince the OP he doesn’t know what he wants and that what he wants in not doable.
It is doable and it’s not hard.
Maybe, just maybe he’s a guy that likes rpm. He must because he’s running a gear most wouldn’t even consider.
There are a number of reasons to not build a 4 inch stoke engine IF you are induction limited.
Let’s think it through.
Using a 4 inch stroke with ANY head with non offset rockers makes the engine induction limited.
You can use a tunnel ram but that’s worse than using 4.56 gears to most people. And that STILL doesn’t fix it. It helps a bit.
Let’s see what engines use a 4 inch crank with PRODUCTION HEADS.
400 Chevy 3.75
396 Chevy 3.76
427 Chevy 3.76
454 Chevy 4.00
470 Chrysler 3.91
What do we see? One 4 inch crank. The OE’s aren’t stupid. They are FAR more concerned about drivability than power.
And, a 375 horse 396 had square port heads on it. It’s only 375 horsepower and it needed all that port area.
I forget the 427 numbers but I know a 450 horse 454 had square port heads too.
And none of the above was an rpm screamer.
Look at the G3 Hemi. How much stroke does it have?