Depends on how much money you are trying to spend and how long you want to wait for it. I would just suggest stock ls internals with a t3/t4 turbo at 8psi...

About axles, check out hasport. This is the way I see it, if you are going to be running drag radials then yes get axles because they will snap if the tires arent allowed to spin when you launch it. If your tires are not as sticky then you really dont need replacement axles because the tire will break traction before the amount of force required to break an axle is reached...