I've been working on the J-H project for a while now, thought I'd post my progress.
The front suspension was pretty time consuming. The original setup had no camber adjustment provision so I had to modify the upper control arms. Here's the front suspension about halfway figured out. The outer tie rod end is Miata, I only had to run a 1/2-20 tap to clean up the threads and they spun right onto the J-H inner tie rods. This fixed the original bump steer quite nicely.
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Here's the front suspension assembled and ready to install. The shocks are QA1 coilvers with 550 inch pound springs.
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The stock J-H rear axle has no aftermarket. So I decided to narrow a RX7 GSL rear axle; 3:89 gearing,limited slip and disc brakes. The stock J-H axle is 54" drum to drum, the RX7 piece is 57 3/16". So I had to narrow the rear axle. It was a crappy rainy day today so I got busy disassembling the rear axle and cutting off all the stock RX7 bracketry.
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Here's the RX7 housing after all the brackets were stripped, the bearing carriers were removed and the housing was narrowed. I have to build a jig so I can keep everything straight when I burn it all together. I got the inspiration for this part of the project from this Web page: http://the-mite.com/mite22.htm Many thanks to aeronca 65t for pointing me to that site!
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I have to send the axle shafts to Dutchman Motorsports to be cut and resplined, I will also have them redrill for the Miata 4x100 mm bolt circle.
Next up: convert the RX7 bellhousingfrom hydraulic to cable clutch. This will involve moving the pivot to the opposite side of the bellhousing. Should be fun. 
