I bought a HEI distributor, too wth Chinese components. If you can interchange some parts from your old piece it is worth. Aluminium and steel components seems to be good.
What I found out, is that the distributor cap plastic material is cheap "hard" plastic compared with the old part. I live in germany and due to shipping the distributor was damaged (cap comes with a hole at side). I think the original plastic cap is much stronger.

Sven
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1947 Chevrolet 3800 1-ton long bed
292 cui, GM 14 bolt rear-end, 4 x disc brakes
In Frankfurt, Germany
Pictures in the Forum Gallery