NFS Pro Street tuning help @_@

I just finished playing Need For Speed: Pro Speed for the night. I have been stuck on a few things in the game. I searched the net but there are no guides out on gamefaqs and the random google help isn't good. I have a 69 Dodge Charger R/T I have been using for drag racing. I have lvl 3 Power and Handling, I also have lvl 4 aero. unfortunately I seem to only hit a max speed of around 160 MPH. I have seen youtube videos with other dodge chargers going around 230mph in the game. I am guessing the tuning that other people are using is amazing. Does anyone know what I can adjust to get up to speed without blowing out my engine anymore.

For a side note I am also about to race the grip king but my 350zx seems a bit outdated. I don't have anything unlocked as far as I know but their has got to be plenty of other options to use. Any suggestions please comment.