I need help installing some cards

[Boot_WB]

You can just install CybergraphX v3 and choose the CV64/3D during installation - no additional drivers are needed.
CGXv3 can be downloaded from several places - I'll recommend the Unofficial Phase5 support site. You can also download the CV64/3D manual from there.
CGXv4 is available, but is a commercial product so you would have to buy that if you wanted it (unless you already own it of course). Should you install CGX v4 you will need to either:
1) Install the latest update (also downloadable from the Unofficial Phase5 support site)
or
2) Install Exec44beta4 available from Piru's homepage
Otherwise your CGX screenmodes will not be visible within screenmode prefs, due to a bug in the CGX system when using exec library >v40. In fact, this might also occur with CGX v3 - I can't remember. If so, install the exec44beta4 patch.

Picasso96 also supports the CV64/3D, but as I've never used it with that board, I can't recommend it myself.

[Boot_WB]

Software for the Delfina Lite can be downloaded from this page, however I'd imagine that the version of AHI which is bundled with OS3.5 and OS3.9 will contain the latest driver developed.

I'd advise just installing AHI - if it does not contain the driver for the Delfina you can always install it afterwards, then select the Delfina board in AHI prefs.

[Boot_WB]

You can use the CGXmode tool (in prefs iirc) to make other screenmodes available.

Since you can at least see one CGX screenmode available then you do not (at this stage) need to install exec44beta4 - if this was required you would not be able to see any CGX screenmodes, only the native Amiga ones.

You could always put an advert on Amibench asking for anyone with a broken A3000T, but I think your chances are slim. Also, Amibench is a bit crippled at the moment due to a spambot creating a ridiculously proportioned ad.