From Aussiespeed "The AS0625 DCOE Weber Performance inlet manifold to suit the Chrysler Slant 6.
 
Aussiespeed CNC machined Australian made triple DCOE Weber manifold, while they are a sand cast casting and we do see a bit of variation the port runner height at the cylinder head flange is 37mm high and a port width of 30mm wide. As the runner transitions from a 45mm round back to the square/rectangular shape closer to the head face there is material there for extra porting.
 
The Aussiespeed Slant 6 triple weber manifold runner length from the headface to the carb flange is 145mm throttle bore diameter is 45mm on the carb end.
 
The Aussiespeed AS0625 manifold has 3 drilled linkage mounting posts that are drilled 5mm. The are not tapped but are the tapping size for either 1/4 unc or 1/4 unf. The linkage mounting holes can be drilled larger. 1 vacuum take off is drilled for a vacuum fitting"