Help to get MachineHead tone!!

I would go with 5150 and a single sm57.
If I'm not wrong (someone posted here a long time ago), the settings on the amp were

Input High, Channel Rhy, Pre Gain 7, Bright In, Crunch Out, Low 7, MID 2, HIgh 4.5, Post Gain 3, Resonance 7, Presence 9.

Also, use a tube screammer in front of the amp.
I'm not sure what were the settings used.
Probably Drive about 9'o clock. Tone and Level (from noon) to taste.

Mic the cab with a SM57 and find the spot.

Good luck!