yea that form has alot of info.
what are the benefits you want to get from the conversion?
if speed is most important: look into a turbo kit. a pretty affordable, light-pressure turbo will dramatically improve in-gear acceleration and top end performance. for under $1000 you can cut 0-60 time by 3 seconds (into low 6s i'd guess). any subaru boxer engine and drivetrain can handle a bolt-on turbo upgrade without becoming unreliable.
if handling is more important: do some easy and cheap mods first. the reason everyone gets a strut tower brace and a new wheel/tire package is bc it works wonder!
most people think of doing a conversion all at once, to the max specficiation possible. it usually doesnt work like that ...usually more like: upgrade purchased! now spend time, money installing, tweaking... then repeat.
most people are so pleased by simple mods that they dont go as hardcore as they imagined. a bolt-on turbo, new intake K&N airbox, +1 size wheel/tire package-with good tires, strut braces ===>>> many happy drives for under $3000