cheaper....not necessarily better the kit comes with an expensive clutch, hydralic clutch line, and bolt kit.
the adapter is 300, the flywheel is 300, ebay clutch is 130, howe clutch is 159, and spacer is 30..seeing you can get the engine for 250-500...
its about 1500 ish...
since a uz engine drops into a jza80 with no mods. you can use the betamotorsports jz crossmember(350) to adapt the engine in.. tranny mount would be custom as will driveshaft.
this is all in theory of course..
i think i may just go rb20 or l28