Here's the Special in the 1982 catalogue - available as a frameset only, so any build from the early 1980's will be appropriate. Your fork will need to be of 531 with Campagnolo drop outs and a 1" English threaded steerer to fit your head tube length - size your head set stack height from that. You could get a frame builder to make one. Bottom bracket will be English threaded 68mm, choose axle length to suit the chain set you select. Lovely frame by the way, glad you are reunited. I'd guess the year to be 1980 to 82. Frame sets often hung in shops for months or even years waiting for someone of the right height to buy them!
By the way, according to the table in the catalogue you are aiming for a 40 inch wheelbase, so measure forwards from the centre of rear drop out level with the wheel centre and that way you can find out the position you need the front drop outs to be in (fork offset and rake).