Welcome to FTE.. We can help you out your truck sets up like a 6.2L Raptor just different gear set. You will be surprised what we can do with a reflash just on 87 cheap gas... Check out some of the Raptor forums see what our service and product is doing in the real world.
You can definitely remove the speed limiter with a tuner, and technically speaking, it will void your warranty. BUT, as we keep rehashing lately, if you flash it back to stock before taking the vehicle in for service, the tech will not know you have a tuner, and cross your fingers, nothing bad will happen where they have to yank and examine the PCM. Mike, who posted above, is who most of us use for our tuning needs. Send him a PM and he will be more than happy to help. Welcome!
Hey I also purchased a new 250 white platinum truck. I had a 97 explorer and finally decided it was time for a change. Boy I love my truck. I have sprayed the bed with line-x and adding duralap mudflaps. The forum has helped me with ideas. A new intake is in the works. Great buy!