There is no single best 8HP, adapter or controller. The swap-relevant generations, the full gear ratio chart, what factory torque ratings really mean, who makes adapters and bellhousings, and the two approaches to aftermarket control.
A complete overview of ASE's ZF 8HP conversion kit range — which engines and transmission variants are covered, why TCU support opened up the cheaper Dodge and Jaguar units, what every kit includes, and how to get a combination added that is not listed yet.
Which T56 Magnum conversion kit fits your JZ swap, and what else you need — driveshaft, crossmember, clutch, and wiring — to finish the build. A complete fitment breakdown by chassis.