If you dont ride fast trails, i would personally spend the money on better suspension so it makes the ride more enjoyable.
I have a 4mil playbike on race gas with all the goodies. Has tons of power and yet im on stock garbage suspension. I know it's not what you asked but if i had to do it over again, id do suspension before stroking it.
As for cubs and other drag cylinders, you really need to ride one to fully understand how they make power. It's like a 125 dirtbike but worse. It's nothing then MASSIVE power. Basically gonna throw the front end of your bike up if it hooks. Terrible for anything but WOT. I would do a cub set up in a heartbeat but i refuse to have a playbike with a drag ported type of power band feel.