It might be the difference between a new carb and an old carb.  Carbs will warp, develop internal leaks that affect performance, etc.  The 850 may just need to be gone through.  Also the 850 is a race tuned carb, whereas a 950 (which actually flows more like 800 cfm) is more street oriented.  The A/F numbers don't make sense, the 950 should be blubbering rich at 10:1.  Could your wideband be off Harry?  Maybe needs a new sensor or a good calibration?

Some good information in this thread, and a lot of nonsense.  Let's keep it on topic guys...

That Offy 360 is a single plane, not a dual plane intake.  Not a great manifold, in my opinion.

Alan, years ago I did what you are considering successfully a few different times.  But I would always run one of those "dingleball hones" through the lifter bores and check the fit of the lifters in the bores before I tried it.  In one case I remember I had a couple of tight ones, and ended up using a brake cylinder hone to open up those two lifter bores until I was happy with the fit.  I just did it with "feel" on the lifter to bore interface, with whatever oil I was using; I did not have the tools back then to make any precise measurements of the interface.  But it always worked.  If I were you, I'd risk it...

Car looks great Cory, congrats on a job well done!

I like Detroit lockers and pick them because I have lots of experience with them.  Never had issues with tire wear, and only one unlocking issue in 30 years of driving them (in the rain, going too fast around a sweeping curve, minor blip from the rear end).  The new ones are very quiet, and the old ones sound cool in the right car, IMO.  They also "fit" with a 1960s performance vehicle.  I think the disadvantages of Detroit Lockers are WILDLY overstated online.  And Truetracs just don't have the same appeal...

Cool tool, Alan.  Is there a battery in it, or does it plug into the wall somehow?  How does it operate?  Looks like something I might need...