Hi Rune,
My Weber carbed 289 recently developed 385 HP & 375 TQ with the C30Z Hi Po flat tappet solid lifter cam.
You can see it here and there are links to you tube runs also, see posts 107,108,109.
Tornado TS40 #875
It has a nice flat TQ curve, although it does occur at a higher RPM range than the larger displacement engines discussed.
It is far from unstreetable.
If you would like I will e-mail you the build specs.
Cheers,
S