1971 C10 5.3 First time running

2002 Tahoe 5.3/4l60E swapped into our 1971 c10. We have had the truck since 1986 and she needed some go fast love. Motor has just been rebuilt with BTR stage one Cam, Scat rods, LS7 Lifters, and bored .02 over. Instrument cluster is a Dakota Digital.