It has two holes drilled and tapped on the bottom side for mounting, uses standard automotive thermostats, as well as has a provision for a temperature gauge.
Buyer can plumb the thermostat housing with fittings of their choice as it is tapped -10 ORB for the main coolant flow and two 3/8" NPT holes to provide plenty of options for plumbing .
If racer needs a water neck kit be sure to check out #1100-0066A.