I could well be that nothing has moved, much depends on cam lobe position when the belt was removed. If you were to rotate a camshaft with a wrench you would notice resistance followed with forward motion created by valve springs aproaching compression. Also, pulling on the belt while straining to install will usually move the crankshaft. You say the belt has marks (good news!) and they line up, all may be well. Plus you have hydraulic lifters which are more forgiving (at least until they're pumped full of oil). It's sounding much better today, but I'd still rotate the motor by hand to be absolutely sure.