At the high school level, if you've got passable hurdle form and are a solid 800 runner with decent speed you will be able to run a good intermediate hurdles; your strength background will really put you head-and-shoulders above most HSers in that event. Above the high school level, you'd better have some good natural speed and good hurdle form.
I'd say the two events do have a correlation, but it is not that all 800 runners will make good intermediate hurdlers, but rather that nearly all intermediate hurdlers will make good 800 runners (since both the natural speed and the strength training necessary to run the intermediate hurdles are very similar to that necessary to run the 800).
Just my $.02, though. You should talk to your coach about why he thinks you'll make a good intermediate hurdler, and go in with an open mind.