What braze-ons do you think it would it be lacking?
That was one of the least expensive models available. Any cables could have been simply clamped on to suit either a 3-speed hub... a 5-speed rear derailleur alone... or an additional front derailleur.
Here is some info on the models of the first year it was offered (1970) from Bob Huffords website:
"10, 5, 3 speed. This is the first year for this model. Basically it replaced the Varsity tourist but has painted fenders and a painted tubular fork. The 10 speed has 38 to 100 gear range, stem shifters and a chain wheel guard. The five speed has 39 to 89 gear range, a stem shifter and chain guard. Three speed (internal hub) has 52 to 92 gear range. Shifter is on the handlebars. 5 & 3 speeds have 4 circle chain wheels. All have oval head badges, side pull brakes, and 27 x1ľ tires. Name looks to be on down tube. Colors were Sky Blue, Campus Green, Sierra Brown, Black and White (womenís only). Frame sizes; menís 19", 21", 23", womenís (curved bar) 19", 21". 3 sp. $77.95. 5 sp. $79.95. 10 sp. $84.95. Optional thorn-resistant tubes, $4.50."
Photo here: http://www.geocities.com/sldbconsume.../70ccpg10b.jpg