Tang Dynasty Inscription
interesting question :) i answered the easier parts first:


  玄导时


the modern text should be interpreted as "玄導時代"

the era (時代) of "玄導" (a monk's dharma name 法號)


  母段, 妻扈


the surname of the mother of "楊社生" is 段. then a space, the surname of mrs "楊" is "扈".


  住僧可考的


this modern text would be 

[the era name (年号), donors (施主),] monk-in-charge (住僧) which can be (可) researchable, provable (考 --> 考據, 考證)


  齐成正觉


"齊成正覺", though i can't recognise this verse from the picture, it's quite likely correct. it means

all together (齊) achieve (成 --> 成就) enlightenment (abhisaṃbudhya　正覺 is a specialised buddhism term) 

ok, my recognition &amp; best guess:


３２１　
家母雍ａ
眷段州ｂ
屬　櫟ｃ
緣妻陽ｄ
此扈縣ｅ
功息游ｆ
德懷騎ｇ
齊慶將ｈ
成玄軍ｉ
正嗣守ｊ
覺玄左ｋ
　黎衛ｌ
　玄涿ｍ
顯貞城ｎ
慶女府ｏ
六大左ｐ
年娘果ｑ
二二毅ｒ
月娘都ｓ
八隸尉ｔ
日利楊ｕ
造庄社ｖ
　山生ｗ
　　　ｘ
　．．ｙ
　．．ｚ


judging from the heart sutra on the right, the inscription on the left had three column, each had 26 characters.


  雍州櫟陽縣


in 661, 雍州 was the prefecture where the capital (aka 長安) located, 櫟陽縣 is a county in the prefecture 雍州

edited. well, in the past, it's common to declare one's ancestral home (籍貫), in front of their name. e.g. "通州雷學淇", "武昌劉禺生"


  游騎將軍守左衛涿城府左果毅都尉


"游騎將軍" is a rank name

守 --> 駐守 ~ to station, guard / defend  

"左衛ｘｘ府" or "右衛ｘｘ府" indicated the place stationed, ｘｘ is the name of prefecture.

涿城府 is a prefecture name. now, it's 涿州市, located southwest of peking.

"左果毅都尉" is a post name, another post is, "右果毅都尉"


  楊社生


donor, with surname "楊", name "社生"

all together, 雍州櫟陽縣游騎將軍守左衛涿城府左果毅都尉楊社生 means:

雍州櫟陽縣 --> mr 楊's ancestral home

游騎將軍 --> his current rank

守左衛涿城府  --> stationed 守 in (left guard, 左衛?) of prefecture 涿城府

左果毅都尉 --> his current post

楊社生 --> his surname &amp; most likely, his courtesy name (字)

guess

１ｘ:  deliberate space

１ｙ: 父 (father)

１ｚ: ? (character of his father's name)

end of guess


  母段　妻扈


explained, just to remind "段" &amp; "扈" are surname


  息懷慶玄嗣玄黎玄貞


息 is 子息 --> son

so, mr "楊" had four sons, named "懷慶", "玄嗣", "玄黎", and, "玄貞"


  女大娘二娘


daughter (女), named "大娘" &amp; "二娘"

guess


  隸利庄山


assistant [in the office] (隸), with surname "利", and name "庄山"

２ｘ: deliberate space

２ｙ: 及

２ｚ: 其

end of guess


  家眷屬緣此功德齊成正覺


if one added "及其" in front of this verse, it would become "及其家眷屬緣此功德齊成正覺", which would be interpreted as:

[the above named persons] and (及) their '其" family (家) members (眷屬), caused by (緣) this (此) merit (功德) [of donating to the buddhism texts inscription project], all together (齊) achieve (成 --> 成就) enlightenment (abhisaṃbudhya　正覺)

guess

３ｌ &amp; ３ｍ : deliberate space

end of guess


  顯慶六年二月八日造


ok, i recommend this site to exchange lunisolar &amp; gregorian calendar:

兩千年中西曆轉換, by academia sinica, taiwan

so, 顯慶六年二月八日 was 13th march 661 ad

"造" means "made"

have fun :)