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I just fell over some 40's and think they should go great with the D cam I have.
They don't. With a small cam like the D, Webers are hardly any better than SUs, they just make a better sounding noise. If you switch to a big cam & properly ported head, the 40's are then too small. 40's aren't worth buying, they why they sell so cheaply on eBay.
The manifold you get is important too. The short one from Redline takes a great deal of porting to get it to work properly, so you really want a long one from Misab.se or VPD.
If you have any electronic and/or computer skills, convert to D-Jet, then go MegaSquirt. K-Jet works fairly well too if you kind find an injected '74 car.
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