My C172 is experimental exhibition and although it's not all that easy to switch standard to experimental, for me it was well worth it. My operating cost is less than $20hr compared to over $60 with original o320. It's a V8 that out performs and has all modern bells and whistles, and no mixture control or carb heat....a great upgrade. Exhibition operating limitations are pretty much standard nationwide now and closely resemble that of amateur build aircraft after the phase one flying requirement. So, it can be done, but you will need a good DAR to help.