This is my OP:
I believe it is better to swap to an S13 red top engine because you can pick one up for $1,500-2,000 (with trans). The engine is already strong and with very mild upgrades you can do 350HP on stock internals or a little more providing you do the proper fuel upgrades. If you buy a turbo kit for the N/A engine you'll have to pay around 2,500-4,000 and it still wont make as much power without having more upgrades as a stock red top. Plus you don't get a 5-speed trans included in that pirce!

<-----= Don't do crack