Hi, so I've been thinking of turbo charging an H22a but before I do so I wanna make sure I won't blow it up. So the first question I have is did they ever make any H22a with cast iron blocks or were they all aluminum? And why type of deck were they? 2. If they were produced with iron or aluminum blocks were they exclusively built with red/black tops or did both have the red/black tops? Also any tips on boosting would be appreciated as it's my first time boosting thanks!