[john chesnut]

I found that the Kellison J4 roadster is 67 inches wide. The Miata is 66 inches. This means that the stock suspension cradles could be made to simply bolt into a frame and run with out modification. The wheelbase of the J4 is 98 inches. The Miata wheelbase is 90. Since the engine/trans is connected to the diff I am betting that the engine/shifter ends up in the right location. With the engine set back 10 inches from the front axle line the balance should be great. How about a supercharged 4 cyl Miata engine in the roadster. I'm thinking 1500lbs.

sorry, I was trying to attach a pic of the J4 but it didn't take. I will try again.