I have read all your posts,and will try to respond to them here.
B D 0139=is the Data Processing number,not option code.This was solely used to keep track of the Vehicle on the Assembly line.It became meaningless once it left assembly.
I know this car,I have it's buildsheet and it was recently for Sale on Ebay in Ct.I believe Jim Brady was selling it.
It was just a shell,no drivetrain at all.
Totally for guts.I am not discrediting or bashing this car at all,but it is VERY unique in that it has a VERY late build date for the L-78.Very contraversial.
The build sheet is not rock solid in that it has a tear seam between the left corner(Build date is there) and the rest of it.
It does look like an authentic 1970 L-78 though,but I only have a xerox of it.Some guys do like to make the unusual,just to stir up the hobby,so understand why most will say it looks suspicious.
SSZ15 454 convers.is odd,in that only 454 LS-5 and LS-6 recieved this code,but it seems Baltimore was redundant sometimes,and listed this code improperly.I have other Z25 cars with this Z15 code as well.Yours wouldn't be the first.It does have the 6500 redline tach?
Can you tell me where and how you acquired this car,and what your plans for it are?
I am an Avid fan of the 1970 L-78,and you can click my link below to see my L-78 Chevelle.I look forward to talking with you.
1970 L-78...ON THE MOVE