Jerry's Gaskets has cam position sensors for $150. You'll want to get acquainted with Jerry - seems like most of us do, sooner or later - for all things LT5-related. (Click on the link and it should take you right to the page w/ the sensor on it!)
I agree w/ Secondchance: Pulling the plenum is "a right of passage" for a ZR-1 owner. All the crap you see on the outside of other motors is hidden under the plenum on the LT5. And*, after installing plugs in the
INJECTOR HOUSING coolant ports leading to the throttlebody, and having a long nose "T" star tool or a 4" (~10 cm) Snap-On star extension and a drill makes pulling the plenum off about a 5-10 minute job - about like pulling a carb.
(Oh...and get a set (or two) of the plenum gaskets from Jerry too, while your at it!)
There's nothing scary about the LT5. It is different and requires certain techniques and sealants, etc; different; not intimidating, and actually
FUN to work with, if having the right tools and the FSM!
Welcome to the club! You've come to the right site for "all things ZR-1!
Paul