My friend have just the solution for you. Some may not agree to this but I have done it on two SOHC's and it worked perfectly. And thats called home rom tuning.
First take your ECU open it up, and remove the 28pin eprom chip thats in there.
then go to HEREAnd buy that zif socket and solder it in place of the eprom you removed.
Then go HERE, and buy two of these chips.
Then you need an eeprom programmer that you can get HERE
Now go to
http://www.hybridka.com and read read read, then you can even download already premade tunes and BIN files that you burn on the chip. I have a tune on there made for 550cc injectors, stock maf. The tune is a lil on the rich side with a really good timing map. I ran between 250 and 270rwhp on 8 psi with my GT32.