I have found answers to everything but the last line:
ACC 34447
Anybody know?

This is the tag located on the driver's side firewall of a 65 Vista Cruiser. The entire tag reads:

ST 65-33865 body BF 2180
TR 965-15 paint RR
AC 3447

....also not 100% sure what the 2180 means.

Also assuming the original motor would have been a Rocket 330 (was told current is a 1976 Olds 350)? Transmission appears to be the original variable torque converter Jetaway 2 speed. Anyway to find details on what it was for sure being that it is obviously long gone?

 

I don't know what the AC 3447 stands for. Fremont-built cars often have weird, undecipherable sequences of numbers on their cowl tags. The 2180 is the Fisher Body sequence number and doesn't decode into anything.

As far as engine options, there were two. The base engine was a low-compression version of the 330 with a 2-bbl carburetor putting out 250 hp. Optional was a high-compression version with a 4-bbl carb putting out 315 hp.

Below are relevant pages from the 1965 Dealer Specs book. Note the standard engine listed in the left-most column and the optional engine, L74, in the second column a little more than half-way down.

 

As Jaunty points out, the 3447 number is one of the Fremont production codes that have not been documented to this day. No other assembly plant used them and they do not appear in any Oldsmobile documentation.

2180 is just the Fisher Body sequence number and is unrelated to the VIN.

There is no way to know what the original engine configuration was in this car. It is not documented on the cowl tag or VIN.

 

Thanks guys, I really enjoyed the pages from the dealer book. It is a little disappointing that the AC 3447 doesn't reveal a little more about how the car was optioned.

Also unfortunate that I will never know which engine it came with. I do know it was a Jetaway auto at least because it still resides in the car. Seems like it could have been either motor since it is a custom.

It is at least clear to me now that it is a custom model. I didn't know until I decoded the VIN. It initially did not seem to have enough options to be one, but after looking over the list of standard features for a custom on the dealer book page, it definitely is one. It has everything listed as standard for a 3 seat custom.

Were the build sheets stuffed somewhere on these cars like other GM products? Maybe I will get lucky.....