While every square inch of my car was gone through by
@sfdon , I would consider my car a #2 (maybe 2+?) because some of the interior bits are OE and not perfect (while it looks great at first blush, I know where the warts are).
At a Hagerty event here in Seattle a couple of years back, one of the hosts was their "BMW Value Specialist" - he is/was the fella that set the $$ values in their tool for all our cars. I had a good talk with him about a couple of questions I had for him.....
1 - The disparity in value between the 2.8L and 3.0L cars (2800CS and 3.0CS) - when these cars are very much the same except for some - relatively - minor items....
2- The value of a car that has been modified (like my car with the M90 or later M30, upgraded brakes, auto to manual and so on)....
While he agreed that in the real world, the 2.8L cars are every bit what the 3.0L's are - he did say that the market sets the value and all he can do is reflect it. He said (back then) that he did find the difference between the two narrowing as he thinks folks are recognizing the 'less expensive' 2800CS's being worth what the 3.0CS's are and that is bringing some parity to the market. Since our talk - I seem to have noticed the gap is not quiet as large as it used to be (but it is still there). Will be interesting to see how these values move on into the future as the calendar clicks away and allows the differences between the cars to lessen over time.
For the modified cars, I used my example (1970 2800CS that now has an M90 CSi 'look' Megasquirt motor with 5 speed, later brakes, modernized A/C, completely restored body and so on).....
He said that their ground rule is that no matter how good a 'restomod' is - that car can never be more valuable than a 100% stock, 100 point perfect version of that car. There may be some extreme examples out there that break that rule (think of Paul Cain's car) - but the regular, very nice restomod value should never be above a 'regular' car.
YMMV as always - but I found the discussion interesting....
Cheers!