@larseand Manley gear is always great, and the Chinook is a classic! There's a reason it has been on the market for years.
I would think a component of that caliber would benefit from a power cable upgrade in general. Back in my vinyl days I always felt like I had best results from AC cables that focused on robust shielding to keep noise out of sensitive components like phono preamps.
Recently I picked up the Veritas Cables Aeris on all of my components and have been really happy with them. I'm all digital now but I bet it works just as well for analog. They mention a multi-stage shielding system so that would probably be a good fit.
https://veritascables.com/products/aeris-power-cable
As soix mentioned above, you always want to make sure you get a trial period. I wouldn't buy from a brand or dealer that won't offer such a program.