Appendix B of Moonport has the data you're looking for. (Moonport: https://history.nasa.gov/SP-4204/contents.html, direct link to appendix B: https://history.nasa.gov/SP-4204/appendixb.pdf). Total cost was something like $186m in then-year dollars. However, I'd question how many new complexes you'd need. Two crawlers is enough to support two or even three or four pads (it only takes about 8 hours to make the trip from the VAB to the pad fully loaded), and a Saturn V only spends a week or so on the pad for a launch. Consider that Apollo 9, 10, and 11 saw a Saturn V launched every two months IOTL without particularly stressing available resources--the Cape could launch them almost faster than the suppliers could build them. At full speed, I'd be unsurprised if each VAB cell/pad set could support a launch a month, offering the awesome (and almost wholly unnecessary) prospect of 24 Saturn Vs per year from existing facilities. The main bottleneck that might be worth fixing would be a second mobile servicing structure, which would allow simultaneous preparation of two Saturn V launches, one each on 39A and 39B. for two-launch missions.Also, does anyone know how much building a few new Saturn V-class launch complexes and crawler transporters at the cape would cost?