Hipolito,
Do not despair.
Back in the day, Holley produced '2' different type of
'Street Dominator'' Intakes for
the 'Mopar 318'
* 300-7 {ie; 300-29Z} ....... 'Open-Plenum'
* 701R-29Z ...................... 'Split-Divider' with Rear Balance Tube
Both were listed as 'Medium-Riser' Single-Plane Intakes, with a 'Low-Profile' design.
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'Holley' advertisement >
Specifically designed for 'Stock-to-Mild' 318 Engines, and with a recommended use of a 600 CFM Carburetor, primarily the 'later' Thermoquads found on the 318 >
{which are rated anywhere between 580 CFM's and 650 CFM's, depending on who you talk to}.
The {#300-7} has an 'Open-Plenum', with slightly curved runners which
provides for a 'fatter' torque-curve.
The Ports are designed for 'Small-Port' 273/318 Cylinder Heads, and the
runner-ports are both 'curved and smooth' to provide for a quicker
throttle response over a 'stock' Intake.
The {#300-7} delivers very good 'Low-End' Torque, because of the massive
restriction under the plenum.
It performs well from 1000 to 4800 RPM's.
The {#300-7} has a Carburetor Flange opening designed for a
Carter Thermoquad Carburetor.
http://i362.photobucket.com/albums/.../Holley Street Dominator/HolleyStreetDom1.jpg
The lightweight Aluminum Intake weighs in at a 'very light' {17 lbs.}.
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What was 'not' stated >
The {#300-7} has poor breathing above 4800 RPM's.