R: ifelse statement: comparing data.frames

I have 2 dataframes where im trying to compare the value in one with another If the value matches in both table 1 and 2, then a third value from table 2 is inserted into Table one.

Example Table My DF

    words number
 1      it      1
 2     was      2
 3     the      3
 4     LTD QTY  4
 5     end      5
 6      of      6
 7  winter      7

Table x.sub

   lev_dist    Var1    Var2
31        1 LTD QTY LTD QTY

What i want to say is, if Var1 in x.sub is equal to words in MyDF then insert x.sub.lev_dist in a third column next to the word in mydf

My attempt is below but keeps producing 3 in the results instead of the lev_value

mydf$lev_dist <- ifelse(test = (mydf$words == x.sub$Var1),x.sub$Var1,0)

Results:

    words number lev_dist
1      it      1        0
2     was      2        0
3     the      3        0
4 LTD QTY      4        3
5     end      5        0
6      of      6        0
7  winter      7        0

Can anyone help