I am going to restore a 1960 Impala Convertible that has a lot of rust. The floor and trunk pans are gone. I have access to a 60 biscayne 2 door (that also has substantial pan rust) and to a 60 4 door biscayne which has only minor surface rust. Which would be the better donor car for the convertible in terms of amount of all work needed, especially welding? Should I use the 4 door as the donor car (clean floor/trunk/rocker pans) or should I use the 2 door (more rust but less welding work needed)?