If you dont want to do any engine work then you are limited in what you can do as you havnt said many details , I see you have a ported head? where did you get this done or was it on the car when you bought it?
so the bottom is standard 200 block with standard pistons. If this is the case then a VERY good conversion is light blues on standard comp running around 28psi to give you a very healthy 360hp
