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I have a friend who has a friend that's got a k20a3 with trans that he said he would sell for $500. I don't know any details about the engine yet (miles, how long has it been sitting). What I have in mind is swapping in the engine now and buying a type s head and slowly building it for later installation (maybe cams, port n polish, valves, springs, and retainers). I don't think the engine comes with the ecu, but if I get a type s head I would have to get a the k20a2 ecu, right? Which makes me wonder if I could go ahead and get the a2 ecu and run the a3 engine with it while I build a a2 head. Any advice?

 
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Also, is it true that I'll have to trim my hood to gain enough clearance for the top pulley on the k20? What about the axles, will I be able to keep my 4 lugs? I just bought wheels and tires (4lug). And the power steering, k20a3 has electric right?

 
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yes you can keep your 4lug suspension hasport makes axels for this swap, as for using the A2 ecu on a A3 motor, It should work. My buddy has an Si with a A2 head swap, along with A2 ECU, injectors. This head has been on the car for almost a year and no problems.