The block is similar between turbos and non-turbos, though not exactly the same. Realistically the non-turbo block can handle plenty of turbocharging, but 10:1 pistons on the non-turbo block will limit how much boost you can make on pump gas — perhaps as low as 6psi.

Going back to my first statement, you should not buy a non-turbo FWD 3000GT or Stealth and expect to turbocharge it later. One of us bought a non-turbo ‘93 about 10 years ago and it provided years and years of fun. Non-turbos are generally much more reliable (although at 16 years old, it’s anyone’s guess). If you can’t afford a VR-4 and constant expensive repairs — which you should be prepared to do yourself — don’t even think about turbos.