You do not need cams.

You sure it really a GVR4 ECU. To the best of my knowledge everyone of those were EPROM ECU's. So it sounds like things have been swapped around over time and you need to verify exactly what you're getting.

Agreed. If it's non EPROM it's not a vr4 ecu. I would verify exactly what board it is before swapping it in.

You don't need cams. The only real difference between the vr4 and 1g ecus are the idle, and slightly different maf scaling.

I forgot about that I think you're right all the gvr4 were eprom

I've yet to see a real GVR4 non-EPROM ECU but I've seen plenty of GVR4 ECU cases with non-EPROM DSM ECU boards in them.

I wouldn't drive a 1G auto car around using a manual ECU without monitoring the AFR but a 1G running the turbo manual injectors and FPR with an auto ECU will run safely rich and less timing than the manual ECU. SO if the choice was between a known good turbo automatic ECU and an unknown one, you know which way I'd go until I could do better.

There are differences between the between DSM and GVR4 MAF. Can't remember exactly how much different, but the calibration is about 5-10%. Not a lot, but it does throw it off.