Carburetor cfm calculator
I understand, it's the 318.
Ok, if you stay with the 318 heads...and there's nothing wrong with that, you'll not want anything real crazy, so yeah, I think the Performer should be in the running. Also, the LD4B, which is an older Edelbrock intake. REALLY good performing intake, beats the Performer by a good bit. If you can find one without having to hack off a leg, I would recommend that. Also another good choice, IMO is the Holley Street Dominator. Even though it's a single plane intake and it has bigger ports, it's kinda a special piece in that it loses nothing on the bottom end and pulls like snot in the mid range and on top. I would only use it though, if you go much more than "stockish" if that makes sense.
I looked on ebay and the USED Performers are going for like 250-300 or more. That's dumb **** money for a used intake. Maybe put a want ad in the classified section and see if a member might help you out.