A couple of points here:
This engine would not be fun at all on the street. It's a very peaky engine, with an 8000 rpm horsepower peak. It's also 12:1 compression, which means that it would need gas mixed, need to be ran on race gas, or need to be ran on E85.
I built this engine for myself, as a dyno mule, and for a future project. It's a testament to *how good* factory 4V Cleveland heads are. The heads have not been ported, but only have a set of Ferrea valves, along with a really nice valve job. They still flow over 300 cfm at lift. This is essentially a stock block, stock headed engine, with an unported Strip Dominator intake, one of my custom solid roller camshafts, and some half-way fancy rotating assembly components that normal people wouldn't use. You normally don't see a 351C with a 6.400" length SBC connecting rod.
If it were not for the absence of headers for Cleveland applications, I would be steering a lot of my Cobra customers this direction. An inline valve head (Windsor) will only make so much horsepower and the canted valve layout will support huge numbers.