If there is a paragraph mark at the end of every instance of a block of 8-point text, and the only attribute you need in order to find the text blocks is the font size, then you could a wildcard find/replace, as follows:

Find:
(*)(^13)

In the Font section, set the size to 8 points

Replace:
\1 \2

(To be clear, there's a space between the 1 and the second slash)