quite nice...helped a few guys with VW/subies before...
what are you power goals and what kind of powerband do you want?
Just to let you know you have hydraulic lifters in the good old ver 3...the RA's could see 8200 rpm though...
also what are you planning on running for EM? I highly suggest AEM universal or for that motor I can probably get you a plug and play Hydra Nemisis. I'd have to call Andrew to be sure he has the boards in stock. Both are great EM's but the hydra would be more user friendly and much easier to set up.
To save money and get the build going, you can use factory WRX/STi parts...exhaust manifold, uppipe, turbo...