if it's a 95 model year, it is OBDI, guaranteed. it may or may not have the 16 pin connector, but it has an OBD1 PCM, a non-underhood version of the unit found in the 94-95 3.4 W-bodies, which itself is a derivative of the 90-93ish 3800 PCM.
there are legitimate GM OBD1.5 and early OBD2...