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Jim I was running a 315/60 drag radial approx. 30" tall. I recently switched to 31x16.5 QTP that are 31" tall and will have some growth. I should trap at 7300 rpms in the 1/4. my 496" set up was a street/strip combo; pump gas and I used nitrous at the track so the 4.10 worked well. Now I am going to run all motor with a taller tire and the 4.56 seems to be best for wringing everything out of this combo. 
Sounds like you have figured everything in. My 2-cents with over 500 CID is to start with the gears you have now (4.10), that might be just fine. After running it that way for awhile, you can always put more RPM to it later. The car might mph better than you think (145 vs 138?), and drive the RPM up accordingly. And all that torque will likely pull the 4.10/31" just fine (especially if you are running a torqueflite).
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