Paul I think these fit on the Racing beat manifold. I just e-mailed them to find out what the bolt pattern is, It specifically states that it is a weber replacement for the rotary. they can also make them with two injectors per throttle body. THAT'S GREAT!!!!

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=013&item=230019159281&rd=1&sspagename=STRK%3AMEWA%3AIT&rd=1

Tony

Place this at the top of the long pipes near the plenum cum scoop
Otherwise the built in butterflies will disturb the organ pipe
tunning effect. You really need four injectors for safety
and staging with Tracy's system.

Paul Lamar

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