I just blow up my b16 on boost had to be the safc but i was also building a gsr for a back up i have a two pm28 one chiped for the gsr and on stock ecu but i was woundering if i could use my chiped pr3 instead of changing to obd1

 

Going with the PR3 is your best bet because, like you already said, you will have to convert to OBD1.

 

The PR3 will work, but no way to control the secondaries.
Either get another intake manifold or pull out the butterflies and run your PR3