Here's my original on the core support driver's side. Can just barely make out "CF"
It could be CF or CE, it's hard to see. According to heartbeat repro decal:
For the 302 and 350 (255 or 300) it's CF
For the 307, 327 and the 350/250 it's CE
For the 396 and 427 it's CH
For the other 396 it's CG
For the 396, it's CG, for the 302