Sorry Builder, we're cool. I just thought that you'd had me figured for someone who was trying to slam the V10 Ford, which I'm not. Without any doubt, the diesel will last longer, has far more torque, and is in much higher demand. However, the only real problem (and it's a nasty one) is that for a few years Ford used the same head vendor for the V10 as they did the V8s that only have about three rounds of threads for a few spark plugs. It's all too well documented about the Ford V8 engines spitting out spark plugs. A heli-coil works okay for a quick repair, but won't hold up if the engine is put under any real load. The only real answer is for the poor soul with the bad heads to buy some higher quality aftermarket heads that have proper threads for the spark plugs. All you have to do is Google "Ford spark plugs" and you'll get links to all sorts of horror stories about the Ford V8 and V10 engines popping out spark plugs.
If FMC will accept our bid for a couple of Excursions we were high bidder on, I'll likely take one of them personally and just take my chances. With the price difference between the V10 and diesel, I could put on aftermarket heads if I have to and still be far, far under the price of a diesel. Besides that, I have to admit that I've wondered how difficult it would be for me to put a 7.3 in the Excursion if it blows the spark plugs out. I've seen where I can get some relatively low mileage 7.3 PowerStroke engines. Both the gas and diesel supposedly use the same transmission and both have 44 gallon fuel tanks. I'm assuming that all I'd need is the engine, cooling system, and electrical system from the 7.3 donor truck and possibly some different motor mounts?