Jungle Boy will probably jump in with more information, but I will put my $0.02 in on the engine.
Tim Harding built the 464 Chev engine, which has profiler cylinder heads and titanium valves. One of the valves broke near the end of the race, and they had to borrow another motor to finish. Tim took the engine back to the U.S. to do a post-mortem.
I had coffee with Tim (the beer gardens weren't open yet!), and he thought that it was a bit too much motor for the boat. Another guy said that all high perfornamce engine builders claim that!
I don't know what the second line off the pump is for, unless it is to measure bowl pressure?