4x12 cabinet stereo operation

[Kev5150]

I have a Marshall 1960A 4x12. I know that if the switch on the back of the cab is set to stereo then only half the cab works, although I could plug both outputs of my 5150 II into it. My question is, if I would like to use 2 heads, could I plug 1 output of each head (5150 II & the new Peavey Butcher) into the stereo inputs on the cabinet, therefore combining both heads into 1 cab in unison? I'm not worried about A/B-ing the heads, they would be used at the same time. Is this dangerous? How would the ohms need to be adjusted, etc.?

Thanks,

Kev

[Giga]

No problem. Set amp's impedance according to the label on the back of the cab.

Giga