[Robey5]

Sorry for your misfortune.

What I am going to say may be poo-poo'ed by others in the forum, but --- I would finish the valve adjustment, and clean out the various debris left behind from the broken head-stud that you can find... ...then I would drive it for the time being until I was ready to tackle the head-stud job on your own. While you are driving it with broken head stud, I would start to save funds to do the job (head studs themselves are not all that expensive all things considered...) and because you have a Porsche as your 'fun' car, I would set the budget and save 2x to tackle the "while you're in there" stuff that you typically do with the engine out. Be prepared for a slippery slope, you will find lots of things that you may want to upgrade on your car when you're working on it (...CV joint re-pack, various suspension bits (ie: trailing arms and wheel bearings) that can be reached easier with the engine out, maybe a clutch, and all the seals...)

With this impending repair on your hands, I would not push the car super hard, and stay off the track for the time being.