If you're not going to be racing the car, you can use a stock balancer that already has the timing ring attached. Just make sure the balance matches what you already have.
If you're racing, or need an SFI balancer, I couldn't find one that had a timing wheel attached.
AFAIK, there is no off the shelf 36-1 trigger wheel to fit a SBF. I was cruising through e-bay, and found a guy selling wheels of the correct diameter. I contact him, and asked if he could make me one with a bigger center hole, and he could. I think it was <$30.
I sandwiched the trigger wheel between the balancer and the pulley. Of course, that means you also have to space all the other pulley's out by the same 1/8".
For the sensor, if you use a stock balancer with wheel attached, you can use the stock front cover. Easy. Otherwise, you'll have to fab your own bracket.
