I'm a bit confused about using a converted Polaroid like the 360/450 with a newer electronic flash. Will I give up all ability to use automatic flash since the flash has no idea what fstop the camera will choose? Or will the camera default to wide open in most scenarios?

Even with manual flash, how will I know what fstop the camera is going to be at to properly pick the output power?

Is it just easier to use a 360 with the polaroid flash if I want auto flash?