You will need a 100 amp outlet for that old miller. I have used them.
They are all good. What are you going to use 465 amps on? what torch?
Find and read the power requirements on line at miller,com.
I have all inverters. AC tig IS much better than a sine wave and cheaper for electricity.
I use a Thermal Arc Arcmaster 185 AC/DC on a 30 amp circuit with a water cooled torch. I also have a Lincoln V350 DC only which I rarely go over 250 amps for tig. It has a water cooled 350 amp torch. This is on a 60 amp 220 Volt Circuit.
You will see those big ol transformer machines on Ebay for $500 frequently. Shipping not included.....
2012 R1200R !
2000 R1100RT (parts for sale!), 1976 R75/6, 2014 Vulcan 900 Trike
There is a seat for everyone.