extension cab help and combo question.
I've just picked up a late 90's trace elliot 1518T (red stripe) for 50 quid (about $80) on ebay. My work horse is an Ashdown MAG-C210 and I plan to use this as an extension cab. I used to have the paired Ashdown cab but flogged it in a fit of downsizing and immediately regretted it. The TE Is rated at 300w & 8ohms and as far as I'm aware the MAG is 8ohms so this should be fine right? I've checked as much as I can and I'm pretty sure it'll be okay. Just looking looking for some reassurance.
Second question is I'm looking at a decent head as an upgrade for the MAG. When I get there I want to turn the combo into just a 2×10 cab (until that itself is replaced, it just never ends). Now, the amp in the mag is connected to the cab by just a standard 1/4" Jack running out of the back of the amp. Can I just unscrew the head, unplug it and run whatever head I end up with into it? I've read up on these conversions on here and non of them seem to connect this way.
Any help always appreciated.