You want a bad ass adaptor? Buy this! I hogged out my intake and it looks bad ass and I heard gives like 1 HP?
http://www.amazon.com/Trans-Dapt-2107-Datsun-Holley-Adapter/dp/B000CQ47RE
Carburetor Adapter Weber DGV And Holley 5200-5210 Series Carbs To Datsun 1600-1800 Toyota Courier 1.75 in. x 3 1/8 in. Pattern
ONE LEFT!!!
http://www.tdperformance.com/products/adapters.asp?id=3682&rsku=7342