Need Restoration Advice. Looking at buying 1 of 2 '40s for restoration. Both had small dents or dimples from rocks on fenders and body. One still has bare metal, the other had all dimples and dents carefully "filled" and sanded to perfect smoothness before priming. Similar in quality otherwise. Is filling and sanding imperfections before painting good form or permissible in a quality restoration and will the fill bear up long term? In other words, which is the better starting point for a high-quality restoration?