Cometic MLS headgasket will work better than copper one. Can double up on base-gasket between lower cases and cylinder block to decrease compression.
Lots of technologies have improved and new knowledge gained through lots of trial & error in past couple decades. Electronic controls allows things to be done completely opposite of what was considered normal back then (i.e. cam specs). Check out WRX boards for newest and best tech. I recommend to!lowing reading list:
Forced Induction Performance Tuning - A Practical guide - Bell 2003 Haynes
Tune & Modify Automotive Engine Management Systems - Hartman 2004 MBI Publishing
Good read on tuning aftermarket EFI systems:
http://www.megamanual.com/begintuning.htm