Others to try are:
157.7000
159.3375
159.5250
159.7375
160.1375
162.4875 & 157.8875
162.6375
163.7625 & 159.1625
163.8000 & 159.2000
163.8250 & 159.2250
163.9750
164.1125 & 159.5125
164.1375
164.1500
164.4875
164.5750 & 159.9750
170.1125
171.6750
172.1875
172.5250
452.3875
456.4875
467.9500 DragonSpeed
467.9750
468.0875 DragonSpeed
468.1750
468.8250
468.8375 Mazda Joest
The VHF frequencies will almost certainly be NXDN9600 Digital, and cover pitcrews plus I expect the 'real' pit-to-car link. The UHF freqiencies will be analogue and a rebroadcast of the pit-to-car link to meet the IMSA regs. Not 100% of the tie up of freqs to teams, but this list likely covers Mazda Joest, DragonSpeed, WRT and Aston Martin AMR.
All of the pit-to-car links must be UHF (450-470Mhz), Analogue only, 12.5khz spacing and repeater/input must not be separated by >5Mhz. So if you close call or search, that's the band to go after. 24hours should give you plenty of time to tie up all the frequencies and the teams !