Just looked at the wire again says awg 8 cu 3 cdr with awg 10 ground type nm-b. I'm no electrocutionist but I think that means the colored wires are 8 gauge and ground is 10 shouldn't be a problem right 8 is beefier than 10???
Ps please don't take my poor attempts at humor as not taking this seriously cause I really don't want to die and I'll at least have someone more knowledgable look it over before throwing the switch just want to make sure the breaker and wire are correct and I get the right outlet
Yup, 8 gauge is fine, just a little stiffer to maneuver. I prefer screw lugs on receptacles and stay the heck away from push-in terminals. Can't believe those were ever accepted.
Your experience in rewiring receptacles is enough to tackle the job. Just be safe! You won't believe the hack jobs I've seen. No, I'm not an electrician, but have done my share of home wiring.
On that 6-20 receptacle, the left side has both the vertical and horizontal slots. The vertical makes it 20A, backwards compatible with 15A plugs (both prongs horizontal).
Conceivably you could run 2 of those plates on that same circuit. The wiring is heavy enough. The 30A breaker may hold but really should be upgraded to 40A in that case, to prevent overheating.
Just in case you're wondering, 240V GFCI panel breakers are ridiculously priced ($150+). If you ever want to expand with a brew control panel, installing a 50A SPA sub-panel is the cheapest and easiest solution. Your AWG 8 NM-B wiring *should be good for 50A* as long as all your terminations are also rated as such.