GM part# ID help needed...

[JHS]

Cleaning out stuff and found a good muffler stamped as follows:
GM
3845737
3 2 289 8 A

I think it's a mid-yr vette muffler??

[al8apex]

my parts book shows a 3845736 as a rh 327 off road ... lh is 735 ... 64-67

[JHS]

Thanks Jim, kinda what I thought.