Sebring NL,
Do you really mean I would put a stock angine or even an M5 or M635CSi engine in this car ?

Just kidding

More seriously, I have for sure all the correct parts

I did not wanted to post pictures of the parts because they are very dirty on the old pictures I have and I am very reluctant showing pictures of such parts in "bad condition" compared wit hthe condition of the car

. Nevertheless, I am ready to make an effort and post one ot two pictures for you

Please note : Engine, engine cover, Alpina airbox, gearbox etc... will for sure look "as new" when they will be in the car and they will not stay in the very poor condition as on the pictures

I also have the cooled rear end (being overhauled right now) but I could not find pictures of it (even in dirty condition ah... ah... ah...)
Here is the original B2-S engine
Here is the orginal Alpina Airbox. Please note this is a very early, veryt light Airbox as Alpina did manufacture on very few early cars (later Airbox model had ALPINA embossed on it and was at least 2x-3x heavier than this early Airbox). On this very early Airbox, the word Alpina was a kind of sticker and letters were sticked.
Here is the original ZF close ratio 5 gears gearbox (ZF S5-18/3)
To conclude, I also attach a picture of the later (much more heavier) Alpina Airbox. Alpina letters are now part of the casting and stickers disappeared. Such Alpina Airboxes are much more "common".