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Faital or JBL for Acoustic 406?

The original stock drivers were good for the amps of that time, but amps have gotten much more powerful.
 
The 2226 is not really designed for a full range (one way) cab. The faitals will work much better for that. If you use a lot of fuzz, you will not like the JBLs by themselves because they are likely to be muddy and harsh in that application (I think they drop off around 1.5-2k, which means you get all that upper mid harshness, but no definition). Ok for dub reggae stuff or thumpy flatwounds maybe. Get the faitals and wire them in series for 8 ohms. Bob's your uncle.

You could try flipping the JBLs, but you might not have any easier time of it than the current guy, so it could be a gamble if you don't have a backup plan for using them somehow (ie PA sub cabs or insane 2 or 3 way bass/keyboard/PA cabs).
 
It blew while running it with an Acoustic 320 head, eq’d pretty flat, volume around 5, and a big muff.

Ok, not a big surprise as those cabinets didn't have as much power handling (and sensitivity) as today's premium cabinets.

If you will be running it with the Acoustic 320, the 4 ohm Faitals wired in parallel makes sense because you will get 300 watts into the 2 drivers. Same thing for the Sunn 300T, set the impedance switch to 2 ohms.

That said, be sure you label the cabinet clearly as it's easy to forget and them plug it into a bigger amp and end up with 800-1200 watts into 2 ohms.

8 ohms makes sense with the Sunn but not with the Acoustic, as you will get only ~175 watts with the Acoustic at 4 ohms.