Rotate the distributer 180 degrees = 30% increase ?

[Former member Yoder213]

70 k20 with 292 bored to a 318.

When I bought the truck it ran AWESOME. PO had it tuned up nice. when my alternator went out I went to a friends shop to have it looked at by someone who's job it is to know what's right or wrong. They replaced the alternator, and noticed my distributor cap was rotated 180 degrees.
When I mentioned this to the PO (girlfriend's dad), He said that you can do that and its a 30% increase of performance.

I searched the site and web and wasn't able to find anything, anyone else hear or know of this? (He is a fabricator and electrician and has his own business,).

Since rotating it back to stock position its never ran the same....