When building a carbed 2.3L engine for a Lemons car I did some research at some "Mini Stock websites and what I found was that on a mostly stock engine, and an IT engine is or should be "stock", the OEM TFI coil and dist. are all you need. A better then stock TFI coil can't hurt but I'm not sure a MSD type unit will help a IT spec engine much if everything is running as it should.

Most mini stock racers convert to carbs and either go aftermarket for a dist, use the Duraspark part, or use the OEM TFI dist with fixed advance since the FI engines use the ECM for spark control. At the Lemons car first race we ended up going to this last option after the Duraspark dist. was damaged in a freak failure of the alt.