Not in an Mx5, but I have done plenty of RV8 conversions.
My advice, for what it is worth is not to bother. It will cost a load of money to get that engine much over 200bhp, exhausts, cooling and transmission will need a load of fabrication..
I plan to go turbo, there is a guy on the mx5 nutz forum knocking up kits to take scooby turbos. An easy 200bhp for about a grand is a much simpler job.
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