The 318 guys can get one too. I have seen them as cheap as $99 (IIRC) and now out of stock at that price.
In stock with a different seller for $134.10:
Aluminum Dual Plane Intake Manifold for 1967-2003 Small Block Chrysler Mopar 318
Fitment
1967-1991 318, 340 & 360, and 1992-2003 318 & 360 Magnum V8 Engines
Note
This is not a direct replacement for the Magnum series engines with original air conditioning from 1992-2003
1.This intake manifold will compatible with 1967-2003 Small Block Chrysler/Mopar 318, 340 & 360
2.Dual bolt pattern for use with 1967-1991 318, 340 & 360, and 1992-2003 318 & 360 Magnum V8 Engines
3.Dual Plane design for optimum fuel distribution
4.Accepts 4150/4160 4-BBL square bore carburetors
5.Cool Gap design keeps hot engine oil away from intake runners resulting in a cooler, denser charge for more horsepower, torque, and efficiency
6.Intake runner bosses cast in for nitrous or fuel injector ports
7.Port exit dimensions: 1.078 in. W x 2.155 in. H
8.Estimated runner length - Shortest: 5.00 in.
9.Estimated runner length - Longest: 6.250 in.
10. No provision for divorced or heated choke
Specifications
Basic Operating RPM Range:1,500-6,500
Gasket Or Seal Included: No
Application: Application Specific
Center Maximum Height: 5.350 in
CNC Ported: No
Manifold height: Front (A) 4.875 in., Rear (B) 5.750 in. (A + B divided by 2 = 5.3125 in. pad height)
Material: Aluminum
Single Or Dual Plane Type: Dual Plane