When my father passed in the middle of 2020 I too lost all my motivation for the cars, he was my motivation, he would call me multiple times a day and tell me what he was doing on the Belvedere I got for him to race or he would keep me going on my Barracuda as he liked to compare race weekend stories as we lived across the country from each other. I finally had to kick my self in the rear towards the end of 2020 and got the Barracuda back out to the track only to tear a tendon in my arm rolling the window up while being strapped in, lol, weird deal. I think the hardest part for me was he kept me focused and motivated with the cars and once they pass you soon come to the realization that your phone will never ring again with Dad's cell showing up on it. Take care and I know what your going through and your Dad is looking down smiling seeing you work on his old car.