hey Mate
if you have no time and have the factory L series turbo pipe just bolt it up and run it, when you consider the boost your going to run and the time you have there is no real benifit to cut an pasting and intercooler untill after you have the whole thing running + its still winter lol
dont get me wront intercoolers will help and are a almost a must on a modified turbo car but given your situation at present id wait till after nationals rather than rushing around and chancing not being ready???
just my take on this