600whp on E85 is about the common go too, these day for stock engines. I ran mine daily at 700whp for about 15k miles. Ended up making more power later and still never ran into issues.
Quality of install and tuning needs to be perfect to accomplish this on the stock engine. No need for cooling mods other then oil cooler like you mentioned.
Fuel system CJM S1.SE, set of ID 1000's and a aero 340 pump (can do a walbro 450, but not needed)
Clutch and exhaust listed will work as listed.
From watching these cars for many years, people over build from my experience.
The stock engines are very strong when setup properly. I also tell people if your goal is under 650whp the stock engine will be more reliable is some ways.
Good luck
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