Remember, the purpose of a hifi amp is to sound clean and uncolored. On the other hand, coloration and distortion are at the heart of guitar amp sound. I think the ST70 uses 4 EL34s for about 35 watts per channel. You'll need to push it pretty hard to get overdrive and it will be loud!
I don't know Tom Verlaine, but I think a pair of 8s will sound rather thin. Amps like the Fender Champ got away with this, but they had highly overdriven output stages (single ended class A!) to fatten up the sound. Even so response on the last 5 frets of the low E string was weak. Also KEFs are way too clean. Speaker distortion is part of the sound. Consider 10 or 12 inch guitar speakers.
On the plus side you can use stereo effects. In fact you could mate it with a stereo effects processor (there are plenty out there) and get floorboard control of volume to boot.
I don't know that I gig with such a rig - home stereo gear might not survive road rigors well. It might make an interesting studio rig - or not. It is an easy experiment to try it out - let us know how it turns out.
I don't know Tom Verlaine, but I think a pair of 8s will sound rather thin. Amps like the Fender Champ got away with this, but they had highly overdriven output stages (single ended class A!) to fatten up the sound. Even so response on the last 5 frets of the low E string was weak. Also KEFs are way too clean. Speaker distortion is part of the sound. Consider 10 or 12 inch guitar speakers.
On the plus side you can use stereo effects. In fact you could mate it with a stereo effects processor (there are plenty out there) and get floorboard control of volume to boot.
I don't know that I gig with such a rig - home stereo gear might not survive road rigors well. It might make an interesting studio rig - or not. It is an easy experiment to try it out - let us know how it turns out.