1-can anyone shed light on where the engine ground strap attaches to the body? There are two tabs on my transmission tunnel, one on the driver’s side (LHD drive car) and another larger one on the passenger side. I believe that it’s the passenger side tab as I seem to recall that the ground strap attaches to one of the starter bolts. Does that sound right?
Yes, that is correct. One of the engine-bellhousing studs connects to the other end of the strap.
2-I can’t recall how I have installed the front coil springs before. There’s not much room there and with stock spec springs that thing needs to be compressed quite a bit. Do regular style spring compressors work for this job?
I think you will find that most commercial spring compressors interfere with other parts of the front suspension. Lots written on the BB about using two lengths of threaded rod between the spring pan and lower arms to compress the front springs.
BMW E9s (CS, CSI, CSL) had a really nice antenna option which mounted to the a-pillar which kept them protected from damage, and integrated with the body lines very nicely and unobtrusively.
As a long-time BMW e9 owner, I don't think the type of antenna you are referring to was a common feature on e9's. Like on the Alfas that were their contemporaries, BMW e9 radios were dealer-installed. Some came with their antenna on the LF fender, some on the RR, etc., but typically these were the simple, mast-style.
I can envision the type of antenna you are referring to - mounted to the LH windshield pillar. Might those have come on 2002's like in the photos below? A quick look at BMW parts suppliers (2002haus, Pelican) didn't turn up anything, but someone must offer a replacement antenna of this type. No reason it wouldn't work on an Alfa GT, and would be period correct.
A hidden, electronic antenna is another choice. From my experience, these have weaker reception than an ugly old mast, but I'm sure radio signals are super strong there in the Santa Cruz Mountains (ha ha).