Rims and Tires 67 c10 truck

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Welcome TDH1989
Yes 5.5/7 is 5.5 front drop & 7 rear drop
I am also new to the C10 world & I'm also from Houston!! I have only owned my 69 SWB fleet side since Feb of this year.
If you click on my name then on my postings you will see that I have been asking the same question for a while now & I have had some nice guy's reply but no one with the same set up you & I are looking for it's like it's an Ancient Chinese Secret Lol!!
I can tell you that I just did a 4/6 drop on my 69 (4"front 6"rear) & I am very happy with the results you can go lower but you may want to look at your truck with the 4/6 drop first I think you will like it.
Oh & by the way 67-69 have the same frame & axle set up as far as I know if I'm wrong I know someone will point it out & let us know.
But as far as someone that actually has a static drop big wheel 67-69 truck & giving up his recipe from experience looks like we are on our own buddy Lol..
But if I keep searching & figure out the proper tire size & wheel backspacing I'll let you know & if you figure it out first let me know pls