On my 62, I broke the piggy bank and bought an Optima battery. You just can't go wrong with it. You don't have to trickle charge it if you don't drive the car all the time, and it charges up fast too. Now, an Optima looks way out of place in the vintage surroundings of our engine compartments. So I ordered an Optima tar top cover that Eckler Corvette sells. With some slight modifications, you can have the battery look like it belongs there. Kenyon brought up a good point on the battery disconnect switch. It's good practice to keep a battery disconnected from the car as it sits in order to minimize the galvanic effect which aids in the corrosion of body parts.
Chris Middlebrook 62 Custom Southampton