97CobraXX

ok guys I need a little advice. I have a 97 mustang with an 01 4.6L PI motor with a procharger on it. I believe I have a bad head gasket. I am wanting to do a head job on both heads. I was thinking on having them ported and polished, valve job etc. My question is : what all should I have done? Here is a little about the car. It is currently pretty stock on the motor side except for the supercharger. I have long tube headers, x-pipe, 410 rear end. any advice on the size of porting, type of valve job or anything for that matter would really help. Its not a drag car or track car, its just a personal toy. I would like it to run right for what I have. Thanks in advance for any advice you can help with.

97CobraXX

I would also like to have a new tune put together once the head work is complete