The gains on the V10 are fairly similar to those on the 5.4L. The only difference is about an extra 6-8 Ft. Lbs. of torque. Mileage gains are about 1 to 1.5 MPG and there's a nice low to mid RPM bump. Top end on those engines is somewhat lacking, mostly due to cam profile, but you don't by a V10 to be a high RPM screamer so it's not a big deal.
As for the mounting pod, the programmer should fit in pretty snugly. Those particular pods don't use the gasket like the later pods do, as they are form fit to the programmer. If don't mind, could you please take a photo of the pod so we can get some sort of idea what wrong?
As to what method to use to sell "pop" on the programmer? Fuel economy gains are usually a good approach, along with the monitoring and adjustment (tire size, etc) capabilities.
I hope this helps. Have a happy New Year!
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1996!
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