cap upgrade for audio research classic 120

What caps should I replace to update a audio research classic 120
What do you mean by cap upgrade ?
Power cap upgrade ?
In that case AR used 6 caps of 800MF 450V (grey color), i didn't remember the brand, the official replacement in AR is BC caps 800MF 450V. I saw some AR owners who replaced the BC caps by Mallory ones (computer grade caps)
I hope this helps