Digital BW, The Print

I have a Mac running 10.3.2.  I use PS7.01 and calibrated my CRT with MonacoEZcolor.  I 
also created a profile for my film scanner with Monaco.

After I scan my film (without color management), I open the scanned image in PS7 and I 
select my scanner's profile in 
"Assign Profile".  I then change my image's mode to grayscale.  Should I then use the 
"Convert to Profile" command and select Gamma 2.2 and then edit my image?

QTR says that one must use a gray gamma setting of 2.2.  The gamma setting on Macs is 
1.8.  
So I should go to "Color Settings" in PS7 and where it says "Gray: Gray Gamma 1.8", change 
it to  "Gray: Gray Gamma 2.2?  Or should I put Gamma 2.2 in the "Convert to Profile" 
window in PS7? and leave PS7's Color Setting as is?

I'm confused.  Any help will be appreciated.

Thanks.