The DOHC block and the SOHC block are the SAME CASTING NUMBER.

The heads will fit on each other.

The DOHC PCM provides more gas than a SOHCPCM does so therefore its better if you are using a Turbo.

The DOHC PCM from an Automatic is a ***** it redlines at 5800 Rpm but with a Turbo you wont need to push your car that high....lol because you should have won the race allready.

Your SOHC PCM for an Automatic might actually redline Higher than a DOHC Automatic Pcm.

The Manual PCMs of either the DOHC or SOHC is what you want if your going for a higher redline.

 

and you cant use a turbo in any of these stock 4 cyl race classes.
they outlawed it because its unfair,...a turbo 90 talon won the pure stock feature after killing the rest of the 4 cyl class all year.