The slant or the 318
If you want a simple multi carb set up get the offy dual 1bbl
http://howellautomotive.com/1960-68...sixintakemanifoldfordualstockcarburetors.aspx and then get a matched pair of holley 1920's.
Or you can pick up a super six intake(I have one for sale) for around 75.00,and run a carter bbd,holley 2280,or holley 2300.
These are the best two options for a stock cam/compression motor. When you bump the cam/compression up I would go to the 4bbl,or more exotic multi carb intakes($$$)