Mike - I'll 2nd Wally info and add some detail. The 1962 235 Truck specs from Chevy show the original equipment plugs were AC45. If it's by chance a transplant from a car, Chevy called for AC46 plugs as the base spec. You can still find NOS AC45 plugs for sale, mostly on eBay, but there are a little more modern equivalents like the AC Delco Gold R45 (a resistor plug) and a whole slew of others listed in this
Cross Reference List.
Just my opinion, but I would say go with the base spec plug and probably a new set of wires like Otto suggested. If your plugs are old and tired, chances are your wires and other distributor components (points, cap, rotor, condenser) are likely in need of a refresh too. It's not a ton of money for these items and you may be surprised on what some fresh goodies will do for your engine.
On a note on condensers, I'm a firm believer in folks getting in tough with Stovebolter Jon G. He's developed and offers some superior condensers that you can read about in this
Detailed Posting. They out perform off the shelf mostly made in China junk and many folks will attest to this.
