I think their flow numbers are optimistic, have the heads ported with particular attention to the bowl area and around the guides where they protrude into the port. Spend some money now and you'll be happier later. Try to use a cam that takes advantage of the flow numbers you get.
Since you have race heads you'll need long valves, might as well buy 2.08 intakes and get the extra flow, you'll need it for those cubes.
Lastly you'll need 2 inch installed height valve springs, the billet offset rocker hold downs and shafts with offset hold down holes. You can get aluminum roller rockers from Crane and if you have the dimensions they will even make you pushrods.
Of course you'll need a W2 specific intake and possibly headers to match. Be sure to check your valve clearance with the larger valves.
Oh and welcome to the world of actually building an engine and not just assembling one.