When I haven't winterized yet and the temps get cold, I place a quartz heater in the engine compartment and close the engine cover. Keeps it nice and warm inside, and doesn't get hot like a trouble light. a quick drain of the block and a heater may be an option.
CUSTOM WHEEL & TIRE PACKAGES
$99 LED LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBURETORS - $235 DELIVERED
Email - firstname.lastname@example.org