Got it to 67 odd ly without touching too much on engineering, keeping only the two vehicle bays, and the xeno and manifest scanners
By swapping shields to 3D and removing all the boosters (just to have insurance against dodgy landings), you could downgrade the powerplant to a 4A, engineered for low emissions, which in turns makes it useless to equip heatsinks. Also, you can change the optionnal effect on your FSD from thermal spread to mass manager and get a very noticeable boost in jump range.
Just a few ideas