Frame height questions

[buddylee]

Ok I hope this makes sense

I am building my 68 c10. I have the frame level on jackstands ( not sure of height of top of frame as I am not home)
I don’t have a bed at this time.

Here comes the fun part.
I have a 1984 corvette rear end that I want to add to the frame.
I need to determine the height from top of frame to axle centerline that will get me in the ballpark in regards to ride height. I haven’t picked out wheels and tires yet but I’m thinking 18/19s and around a 4 inch drop

Does this make sense or do I need to get my parts and pieces?