That's highly unnecessary. A regear is so much cheaper and will give you power. Not to insult you but do you understand how a regear will significantly improve power transfer from your engine (which is a strong engine) to your wheels?
And do you know what's required for an engine swap? It's not just a pull out the old, bolt on the new.
1998 TJ, 2.5" OME springs, OME N66 & N67 Sport Nitro Shocks, 33x12.5 Goodyear MTR's, Metalcloak front trackbar, JKS rear trackbar, Metalcloak aluminum front arched fenders, Metalcloak aluminum front bumper, thedirtworx tire carrier, Warn xd9000i w/ synthetic line and TRE Safety Thimble II, Monstalined interior