It runs fine and has tons of low end torque. Sure if I had a massive cam in there I'd lose low end, but that usually happens with having a lot of duration. I can see a small block being more sensitive to a tunnel ram, needing more stall and gearing. But it really does run well on my 440. The low speed torque is very strong on this setup. I've had a single four on hear and the dual quads on a dual plane CH28 Edelbrock manifold. It makes more power, with very little change down low. I run 3.23's an 28inch tires, it shreds the rear tires at will. I am surprised by this. I know if I had more duration I would need more stall and lower gearing. Also I drove to Minneapolis Saturday, about 80 miles on the freeway and got around 15 mpg! This was at 75 mph. I'm not trying to start an argument, I just think they are a lot more streetable than people think and assume.
