Depends on the power and parts used, but if you are looking at a roller valvetrain (cam, lifters, rocker arms, timing set, oil pump drive, custom thick wall pushrods) it gets expensive fast. That is if you use heads that already have the correct valve springs, retainers, locks, and locators.
What I am getting at is the valve train parts likely will be more expensive than the stroker kit.

If a mild build with flat tappet cam, then the valve train cost gets less expensive.

Plus, if your having the machine shop build and dynotest the engine, that is likely to be $1,000 added to the total?