My two cents...
Fuel pump is definitely overkill. By my rough calculations you'll need about a quarter to a third of the flow rate that a silvertop puts out and you need it at half the pressure it produces. The SU pump that Minisport have would be my choice if you're looking for a good quality pump
http://minisport.com.au/mini-su-genuine ... tive-earth
Else Supercheap have a little Goss pump which produces about 4.5 PSI for 120 odd litres per hour which would also be fine but you would still probably want a reg in line to knock it down to 3 odd PSI.
Extractors are going to be a compromise given your cam and head and road driving. Smaller bore extractors should be much better for the road as the engine should come 'on cam' sooner because of the higher speed gas flow but they will more than likely run out off puff before you get to the maximum theoretical power. Larger bore extractors will be the opposite - less low speed torque but a better top end. But there are lots of factors at play and the only definitive way to know would be to test them back to back on an engine dyno (or worst case a chassis dyno with a knowledgeable operator)... If you're serious about racing then I'd be organising a dyno session but if you're doing it more for fun (no objections here
) then take a punt. You can always change them later