I ran dsm 450's with a s-afc hack self tuned(it isnt the best but it works somewhat) 6 years ago.With dsm injectors fitting into the honda fuel rail with little modification and no need for a resistor box or different injector clips(unlike your volvo injectors) and being $50(for a set) its the cheapest/easiest route.Being your building the motor you prob wanna go obd1 like everyone is suggesting to get a good ems and make good power.