if you are on a small budget you can probably get away with an off-the-shelf turbo manifold, buying a 2nd hand ebay turbo off a nissan forum, connect up those oil lines, run some water lines and run some pipework through an intercooler from your turbo to the inlet manifold, get a tune and laugh away.
if you can spend some money get a steampipe manifold made up with equal length pipe, new exhaust. brand new BB turbo (won't get into the size debate here) and get a really good tune on a dyno.