Hey there, excellent taste shown if it is an FE.
Here's what I can tell you from the info you have supplied:
The motor is definitely not the original, but is a grey of FB/EK vintage
The body id suggests it's an FE, and the body number tells you it was built in 1958 (the leading '8' in the number). Both FE and FC utes were made in 1958, so it's hardly conclusive - a '7' would be
The Trim nos tell me that it was painted "Elk Blue", with a "Comet Blue" interior. An FE combination, but the body plate says FE, doesn't it...
Use of the FC bonnet mascot on FE bonnet is uncommon, but not rare. An FE ute should have die-cast "Holden" chrome strips on the front guards behind the wheel arches. FC utes have a short die-cast spear, not sure if that's what you've got or the stainless "Special" trim (that has a matching piece on the door as well, if it helps). Perhaps the front guards were replaced after an accident?
Hope that's some help to you, and apologies if any of it was teaching you to suck eggs
There is an ad for the FE Ute in the "Original Advertising" section that shows what they should look like.
Hope you enjoy your new machine.
cheers
RET