Well stated. Most love the car and what it is, as is. But you own the car now. Do as you wish with it and enjoy it. Take liberties were you need or choose. I went and go through that too. My story (in my signature) was finding my dad's old car. He bought new and raced it while owning it. It is a true Mr Norms GSS Demon 340 6pack car. I found it in a barn in 2018 after 34 years. I found it, put it back to as how I rode in it in 1982 when he sold it. And then took liberties to make it mine. Fortunately I am still cruising the car everywhere I can and with Dad in his Cuda. It has been amazing. Do what makes you happy. Personally I would keep the tunnel ram and hemi, change the 4spd to something easy to use but leave most as is. Baddass as your FIL built it