I went with an Earl's sandwich adapter attached to the remote filter head.
https://www.holley.com/products/plum...t/parts/502ERL Starts to open @ 160f, full open by 180f.
Improved Racing does make nice looking equipment.
Personally I like the Integral Thermostat Filter head or Sandwich adapter over any In-line thermostat simply because you only have 4 hoses VS the 5 hoses with an in-line installation. Just a bit cleaner look without a loop-back line.
If my Earl's sandwich themo dies I'll most likely buy a Improved Racing remote head thermo in 185f.
Remote Engine & Transmission Oil Filter Mount with Thermostat ENV-170
Routing description on different types of installs:
https://documents.holley.com/199r10647rev1.pdf