Yes it´s a lot of work to do! but at-least for me it´s also fun
are you installing a "standard" or modified TS?
Absolutely, it's very fun and very educating as well!
I think also it's very special when there is a lot of family history with the cars, as in both our cases. My father actually owned the car i have now for about 10 years, during the 80s to the early 90s, it was his crown jewel. I found it by coincidence in a barn and brought it back home, so now i am slowly bringing it back to life. It's really nice to know all the history of the car as well, as the guy i bought it from, was the guy my father sold it to via a dealer back in '93. So, when i wonder about work done to the car, i can just question my fathers sanity.
I'm actually going to install a 155 8v Twin Spark so it is not the regular 75TS engine. This one is modified with race camshafts but other than that, it is original. However, it will need some modification to fit with the sump and the gearbox in the bertone.
The 155TS is a lot better engine than the 75TS though, as it has better intake channels and better ignition system. I'm also going to keep the stock fuel injection system, with some modifications. No carbs.
I actually got this 155TS engine, fully restored 4 years ago, for 500 SEK(!) so i would say that made a pretty good deal.