Engine Pre-Heaters/Preheating Techniques

Greetings Skymaster afectionados! I recently purchased a 1967
T337B. I would like to know if anyone had any suggestions on
a pre-heat system? In my last plane (Comanche 250), I used a
glue-on oil pan heater....I realize this does not address the
crankcase...Also, I would like to say that for a new 337 owner,
this website and message board is invaluable.. I have already
learned mucho.. Thank You very much!
JIM