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My car is under full restoration now (status of bare metal with some cuting/welding going to replace rusted places) and this is the last moment to take final decision I am struggling with - should I stick close to original when restoring or upgrade the car as there are many signs logic says to stick for original but I would upgrade myslef for more comfortable frequent drive, as the intention is to keep the car for long, but, as always, situation my be I have to sell ir and then value would matter. As this is my first classic car, have no clue how to act and would appreciate some help:
The short info on the car:
BMW 3.0CS (1972), Riviera, VIN 2230141, having info and some documents since the first owners, just a few days ago also received BMW certificate confirming that engine complies to the body and full specs that complies to actual one, no major problems have been noticed with the engine or trans as well.
Original to Upgrade things:
1) Original M30 with Zeniths and 3-speed auto trans to M30B35 with FI and manual 5-speed getrag;
2) Riviera to Black metallic;
3) White original to Brown coniac leather interior;
4) Manual front windows to automatic ones;
5) Manual sunroof to automatic one;
6) Original 14" wheels to BBS RC 17";
7) New wiring and vintage look audio system.
So, the main question is - if I just take all the costs upgrade would require, will it pay off for the value, or the investments | value ratio would be better if I stick to the original one, leaving hotrod idea for some other car in the future (hope, this is not my last E9
that would miss a lot of original state mentioned.
Thanks in advance for sharing of your knowledge!
The short info on the car:
BMW 3.0CS (1972), Riviera, VIN 2230141, having info and some documents since the first owners, just a few days ago also received BMW certificate confirming that engine complies to the body and full specs that complies to actual one, no major problems have been noticed with the engine or trans as well.
Original to Upgrade things:
1) Original M30 with Zeniths and 3-speed auto trans to M30B35 with FI and manual 5-speed getrag;
2) Riviera to Black metallic;
3) White original to Brown coniac leather interior;
4) Manual front windows to automatic ones;
5) Manual sunroof to automatic one;
6) Original 14" wheels to BBS RC 17";
7) New wiring and vintage look audio system.
So, the main question is - if I just take all the costs upgrade would require, will it pay off for the value, or the investments | value ratio would be better if I stick to the original one, leaving hotrod idea for some other car in the future (hope, this is not my last E9

Thanks in advance for sharing of your knowledge!