Acoustic 360/361 - 360 was a pre-amp head with four line outs. The 361 was a 300w powered bottom with a rear-mounted 18" speaker in a folded horn cab
Acoustic 370/301 - 370 was a powered head with a 5-band limited range EQ. Also 300w (if I recall). The 301 was the same bottom as the 361 without the power amp.
It's hard to say which was considered what, but the Acoustic 360 was used more frequently by known musicians (Jaco, John Paul Johns), and I preferred it to the 370 setup. My feeling was that the 360 pre-amp offered a better range of sounds.