oh you're in the US - Steve @ rennsport is your man then. Forum member and top bloke - I believe he does the Jenvey/Rothsport ITB kits too
Rennsport Systems | Porsche Performance Systems and Support
If it were me I'd pay a small premium and go the new Mahle P&Cs. Steve could suggest what pistons and cam grind would be most appropriate for your setup and goals.