Rick, Have you tried shooting the Konica 750 Infrared Black and white in 120 size rolls? I know it's not true infrared being that it is down in the 750nm range but my personal experience has been good with it. I rated the film at ISO 32 and developed it in D-76 for 6 minutes at 68 degrees per Konica's instructions.
The film isn't as dramatic as the Kodak infrared aero film or the 4x5 but the Konica film is a dream to load and process. It has some pretty tight grain patterns so blowups are no problem. If you are interested, I still have some in my fridge that is dated March 2003 that I will let go pretty cheap.
I was shooting the Konica through a 25a Red filter,a 29a might be a little better. Jim