LeonV

Are you trying to imply that SUs are able to optimally feed each cylinder? The manifold design for SUs has been proven to be flawed in terms of mixture distribution to each cylinder with WB02 data-logging. The AFR between cylinders is not consistent, and there are some nice bends in there as well adding more pumping losses. On the other hand, a triple setup gives each cylinder its own venturi. Bends in the intake tract are minimized and the mixture cylinder-to-cylinder is more or less consistent. It is also possible to do effective intake resonance tuning with this setup by simply switching out bell-mouths. Yes, SUs work well and are great for someone looking for street driving and decent performance. However, when it comes down to tuning and maximization of power (or efficiency), the Webers have a profound advantage. Yetterben brought up a good point in that the EP racers need to keep the stock carbs. You think that if carb choice were unlimited that SUs would be preferred over Webers? I think not. As for the OP, if you don't know a lot about cars don't even think about triples, unless your wallet feels too heavy.

SUs are great, but everything comes with its pros and cons. The SUs are easy to play with as long as the throttle shafts don't leak, but they leave some performance and tunability on the table. The Webers are more expensive, but you can tune them in much more detail. This assumes that one understands both systems well. I got a decent set of Weber triples for $600 complete including manifold and linkage. The deals are out there if you explore classifieds enough. I've seen quite a few recently in that price range, in varying condition. Also, don't slap parts on without thinking. You need to think about what you need in terms of what the car will be used for.

Aha! There it is...

Don't run the engine anymore (obviously). Inspect the keyway upon pulley removal, likely it is worn to the point where the key is loose and you need crank repair or a replacement. The pulley is likely wobbling because the bolt has worked its way loose. Has it been disassembled fairly recently? Use loctite next time.