Paul,
Jim Williams Porsche Page has some great references:
http://members.rennlist.com/jimwms/CIS/CIShome.html
On the earlier 78 and 79 that vacuum led to the throttle body.
Also the vacuum connections for the '80 - '83 CIS deceleration valve (13) has changed, and the frequency valve (8) has been added, which is controlled by the Lambda sensor electronics box.
Hope some of this helps,
Shane
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
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