Why a Turbonetics turbocharger? I know people who have had no problems with them and I know people who have had major problems with them. I would use a Garrett or Precision. 15lbs-20lbs would be quite a bit of power. I would replace the pistons with 9.8:1 forged pistons, Eagle/Pauter/Crower rods (prefer Pauter) and new rings/pins. Have you thought about your fuel and engine management?