Get a roll of Rollei IR 400 in 120 and try it in either of your MF cameras. You will need a Hoya R72 filter on your lens for the IR effect (~5 stops filter factor). Start with ISO 6 and bracket +\- 2 stops in 1 stop increments\decrements.
Development is the same as for 'regular" BW. Check the data sheet for the Rollei IR 400 , they have some developer and times recommendations. I do it in HC-110 with the same time and concentration as for any B&W film.
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