I got 106bhp @ 6300rpm out of my old driver with cams, standard carb (with bespoke air intake), advanced ignition timing and no other real modifications, just correct set up. So there is scope for these engines.
I would say go with the DMTL as it's easier and cheaper but there is alot to be said about having a choke per cylinder and if your serious then twin 40's or bike carbs are the way foward.