I had a 1971 Super Beetle (fist year of the Super). I dropped the engine out and put in a 1975 dual port engine. Instead of super slow as shit, I made it slow as shit

I was going to drop mad money on it but I was 21 and broke
I know for a fact your not going to turbo charge that car easily. Your also not going to water cool it easily either. Your best bet is to get a used Porsche 914 engine, or early 911 six. The 914 engine is a direct bolt in and the Porsche engine can be massaged it. Either way you will spend bucks, but they are cool projects!! The 911 engine can be worked to easily get around 200 whp N/A. Put that in a 1700lbs beetle and look out!!