Where are the spark plugs attached? Are they attached to the cylinder head or the engine block itself? Just curious because I want to run the volvo B234F DOHC with Dual Plugs n/a setup and I was wondering if this setup is possible cuz i have heard its a lot harder to convert it to turbo and I don't want to hassle with a turbo just want to hassle with the engine I got.

Thanks a lot. I know one thing I will have a real hard time with - is the timing of everything but once I get it down it will be awesome and I know it would probably get around or over 200HP but my goal is 250HP possible