Hello Mr-p,
The open diff is fine in the roadster, the only time you will really notice the difference is when you are really pushing it on the track or road. You can still achieve some great power slides and donuts with the open diff. The only time you will really notice it is on tight powered turns where it will tend to spin up the inside wheel. The roadster is such a well balanced and grippy car the open is fine. For the cost of an lsd its not really justifiable for the roadster. However, i do plan an lsd upgrade in the future. For the 3.92 diff the dohc is quite good on torque that you will probably benefit from the longer gear range in 1st and 2nd so wouldn't be a problem, mine is a 3.62 and 1st and 2nd are a bit short. You will find the open diff easier and safer to drive until you get used to the handling and characteristics of the car.
The ford 2l dohc is a good engine but its also quite big and heavy, you'll also need to consider replacing the EFi side of the engine due to its size and complexity. Due to its age you will also have it easier on the emmissions tests, no cat required.
The MT75 gearbox is a strong box capable of taking more power than the type but it is slightly bigger and you will need to modify the tranny tunnel a bit and end up with a slightly smaller footwell put won't be a problem. The type 9 is a good box, upto about 250 horses. Fit a quickshift stick and remove the damper and it feels much more positive and racier.
Have Fun.....AndyH
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