Floor shifter or not?

If the car will be only a comfortable cruiser, stuff storage and cup holders would be better than a shifter down there.
If you plan to use a smaller diameter steering wheel you might consider shortening both the column shifter and the signal wand.

Great idea. The future for this car is cruising and being parked alongside other classics on Saturday nights with her hood open....
She has led a hard life to this point. Time for her to relax