input please on this s/c

[C's 94 InTeGrA]

At idle the fuel pressure is at around 50 i believe. Well people has told me to ditch the fmu and do the safc. But one thing i wana know. Should i go ahead and hookup my a/f ratio gauge to see what i am running at cause i am about ready to go out and see what i can do with it. I know i need to get my header and i wana do the upgrade on the pulley. I got a free fuel pump from a friend who has a teg too. its a Walbero 342. So i need to go pick this up this week sometime.