See, here’s the thing with more available power ……. It’s there if you WANT to use it.
Put a more aggressive chain on it, swap the drive gear for something with another tooth, switch to 404 if your using 375………….
A stock 661 is not a slouch, but a ported 661 is an animal!!
You can take a chiwawa for a walk, or you can take a Staffardshire Terrier for a walk. Throw a squirrel in front of both and the power difference between them becomes very very obvious