"It depends"...
I have seen these with all sorts of lengths for the snout that fits on the crank, depending on whether they were used with an on or off center, dry sump or no, gear drive or no..you get the picture. You will probably have to compare it with a stocker to tell for sure. Also, if it has the double rings for the old Buick stand-alone DIS system, you'll need to change it to a single for a stock-style setup.
The other thing to check is the bolt pattern on the balancer for the pulley, which may or may not match a stocker.