I don't know those mics, but if you are going into the D8 mic pre and you are at a show with high volumes (which I assume because you mention SPL), you will very likely over drive the mic preamp input stage. Seach for "brickwall" and you'll find some info about what happens. You can try this at home with your stereo if it will play loudly and put your mics right up to the speaker. It takes way less than 138db to hit the input limit of the D8 mic pre. If you can use a battery box or preamp and drive into the D8 line input, you'll be safer at a loud show.
If your mic preamp is driven within its operating range, the tape should sound good. Good luck.