CLC recommend 8' oars for this boat, which is what we bought for our Passagemaker Take-Apart Winkle.  These have worked out well for us in practice.  There is a photo of Winkle with my son rowing her in a pretty good breeze and chop in the current month's photo contest, if you want to go there and have a look:

     https://www.clcboats.com/voting

Can't miss her; red buoy in the background.  Heck, give her your vote, if you think the photo worthy. <;-)  That photo is also in the Passagemaker Take-Apart photo gallery, currently #8 of 57 in the slideshow.

Shaw & Tenney used to recomment the following formula for approximate sizing of oars for ordinary rowing boats:

     (((Span/2) + 2) x 25) / 7 = Approximate Oar Length

I make the Passagemaker's spread at the oarlocks as 53 inches, which would yield:

     (((53/2) + 2) x 25) / 7 = about 101-3/4" = a bit less'n 8-1/2'

For the Passagemaker, being a fairly beamy sort of rowboat in proportion to her freeboard, rounding down (to 8') rather than up (to 8-1/2') makes some sense, to make sure we're pulling into our chests rather than our belly buttons.  That might be more important for you, if your height makes you a bit long in the torso.

John recently wrote a very good technical piece on the subject of rowing ergonomics:

https://www.clcboats.com/life-of-boats-blog/woodenboat-magazine-240-the-geometry-of-rowing.html.

((A+B)+9) x 1.34 = oar length in inches
  where A = beam at oarlocks in inches
           B = the distance from the water to the bottom surface of the oarlock
            in inches (freeboard)

...which would get us:

((53+11)+9) x 1.34 = approximately 97-3/4"

...again sensibly rounded down slightly to 8'.

I just found an online calculator which I think John and his web wizards cooked up to do the math:

     https://www.clcboats.com/ext/screen-f781f4b64b.html

There's a button to get to that if you go into where you'd order oars which CLC sells.

Heck, if you're makin' your own, start with 8-footers, see how that works, and make a custom length pair if you think something longer or shorter would work better for you.

Remember to have fun!  We think she's a great little rowboat.

.....Michael