Thke best intake for those heads is the obsolete Edelbrock D4B... It is made for that unique bolt angle and size, but are hard to find and fetch a good price when found...
If you put 66 and later 273-318 heads on it, then your intake selection has much more possibilities...
The Wiand stealth intake would be a great intake for that engine with later heads, good from idle to 6800 rpm...