Big block valve cover blocks heater blower motor

Just go to the "How to" Articles section of the forum.
Lotsa ways to skin that cat.
Heater Fan Motor Mod for Added Engine Bay Clearance
https://www.forabodiesonly.com/mopar/ams/heater-box-motor-modification-for-valve-cover-clearance.76/
https://www.forabodiesonly.com/mopar/ams/another-blower-motor-mod-for-bb.103/