i got a twin 40 webbers from ebay @ £150
brand new webber manifold £120
the cam an followers i paid £80
headskim etc was £330 ( skim, port+polish, few valves sorted, gaskets, coolant etc... )
twin throttle linkage £80
ashley 4 branch an full exhaust £100

because my head needed needed valves sorted my head skim was dearer, the same person set up my carbs an fitted all was cheap an really cant remember what he charged but wasnt to bad, he also tightened my sierra cossie diff