Castrol GTX 20-50

Anybody using this oil. I've always been partial to Castrol GTX oil. In the 70's worked in service at a big boatyard and a foreign car dealership and at both places that's all we used. Eventually I got into seriously working and spending less on hobbies, so I started getting my oil changed at the dealership or JiffyLube so it was pretty much whatever they have. Fast forward to today and I still get my y oil changed in my car and van, but I've been spending more time with my Mopars. A 69 b body big block, a 70 small block Duster and a 72 slant 6 Demon. To make a long story longer, I'm finding it hard to find a an old school oil for these cars, especially Castrol which in the 10/30 or 40 it all seems to be blended now. I did find this stuff and was wondering about your input on it. I'm going to use a Fram filter which was our go-to filter back in the day...that's another story though.

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