VHF Modulator

I have a VHF modulator out of a VCR with a switchable output channel of 0 or 1. I want to modify the output for somewhere between channel 7 and 12. The modulator is based on the Toshiba TA8637BF chip where the data is easily available on the net. Looking at the data I am not sure what parts to change for the higher channels or even if the modulator will work at the higher channel. Any advice is appreciated. Rigg

The SAW resonator sets the frequency, it's actually two of them, one for each channel.