318 rebuild for turbocharging

The main issue I'd see with a solid flat tappet is that you'd have to take off the valve cover periodically to adjust lash, and that can become a pain if there are parts in the way you constantly have to remove and reinstall. So it all depends on how you build it. Not sure if you'd really receive all the benefits that a solid cam offers. Those are great for high rpm stability but most turbo engines operate on a lower rpm scale, unless you have a high rpm/high boost objective