Originally Posted by JiMerit Boltr#43
Id run your stock heater, with a voltage drop in line to get 6 v. to heater motor.

https://www.fillingstation.com/detail/4185/Chevrolet_12_VOLTTO6_VOLT_VOLTAGE_DROP.html

Rerouting hoses will be a pain no matter what heater you use, maybe under floor??????
That's certainly a cheaper option worth looking at. Likely the easiest too at this point.