Do I need new buck strip?

I am going from aluminum to vinyl windows in a block house and my current buck strips are only about 1 x 2. When I put in the vinyl windows the screw holes do not line up against the buck strip since the frame is wider. Will I need to install new buck strips or can I screw directly into the block and not go through the buck? The drywall will be between the block jamp and the window frame.

Thanks

You can attach to the block.

i agree.

It is defintely ok to go into the block, although when I encounter this, I usually buck frame it. I can't necessarily say that it is definitely better that way for any reason, it just feels better to me.