[VintageLambo] My Jarama quit running, any ideas?

Hello. I just purchased a 1971 Jarama. I was driving it home and at first it was running very well. I had about a 400 mile trip to complete and I now realize that it was incredibly optomistic to expect a trouble free journey. The car has a completely rebuilt engine and trans and I thought it would get me home. I had to exit the interstate and was stuck in traffic for about 15 minutes. I noticed the car began to run a little rough and thought that I might have fouled a plug or two. It didn"t backfire or get hot. Good oil pressure and no smoke. I stopped for lunch and started the car after about 45 minutes. It was still running a bit rough. I re entered the interstate and was able to maintain 75mph without difficulty. I drove about 75 miles and noticed that the car was struggling uphill. Once again, no overheating, good oil pressure, no smoke and no odd engine noises. I continued on and encountered a steeper grade. Now the car began to loose power and I downshifted lower and lower. The car continued to slow and stalled as I was attempting to exit the highway. We got it off the roadway and into a parking lot. I tried to start it and it turned over easily but wouldn"t fire. I just tried a couple of times to start it. I removed on end of the fuel line after the filter and turned on the punp. It seemed to pump plenty of clean gas. I reconnected it and called a tow truck. So now its in my garage and I was wondering if anyone has any ideas as to what might have happened. I hope I haven"t made a catastrophic mistake. Once again, at no point did the car smoke, get hot, loose pressure or make any nasty noises. Thanks, Steve