Never fished through a hole in the bottom of my car but had an old Mercedes that really did have a full on hole in front of the back seat. Purchased that 200D on 11-11-1959 and if you kept the oil clean is just ran. Pull the cylder pre-heater switch for a few seconds and 'Womp' off the engine would go.
280,000+ and 20 years later I traded in 'what was left.'
How old is your fishing car? My present is a 2002 Jeep Liberty and same thing; key in the slot and off you go. Close to 130K if memory serves.
High flows and skwala hatches mean good fishing on the Bitterroot
Old cars have 'Beach Creed.' Same as old clothing?