Upgrading my 911 from a 2-liter engine and 901 tranny to a 915 mated to a 3.0 liter.
Do I need to get newer driveshafts, or will the ones I have fit? Are there different sizes of these, or what gives?

I've heard conflicting theories on this, and don't want to spend more $$$ than I have to...
I might add that the driveshafts I have today are not of the earliest kind, but I can't really tell how old they are.
Anyone who's been through this procedure?
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1972 911S Targa
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My project!