yep Beta 12A-2
handles much more power for fullrange than a delta, lower resonant frequency and somewhat decent EBP for sealed.
The guitar V4 cabinet is a tank, and yes it is alot to sink into an old cab
would be cool if you could find the Ampeg 2x15 horn loaded cabinet
that would match that V4 head nicely.
Also if you can find a old SWR workingmans 4x12 those come loaded with Eminence special design drivers
very similar to the Beta12A-2
The SWR cab is ported though