You have a lot of researching to do my friend. Bug eyes have great potential to be monster machines. But you need to think about the age of the car and how delicate subies are at an old age. You want to make lots of power but you need to think about supporting mods first and maintenance like the other guys have said.
Start with doing a complete multi-point inspection on the engine first. Check mounts for all engine, drivetrain, and rear diff. check all fluids, hoses, and chassis for signs of rust. Remember the bug eyes are a bit old. After all those things checkout start your build. SUPPORTING MODS FIRST! Exhaust, intake, fuel, clutch, mounts, Bushings. Make the car RELIABLE before upgrading power! There are plenty of Forums here on Nasioc to get you in the fast lane. You also have the help and advise from your fellow members! Enjoy and GL!