Thank you much, guys.
I'm kind of leaning towards the VHT cast silver paint. I'm trying to achieve a natural satin cast aluminum/ cast iron look.. I know cast iron would be more grey than silver.
I have also thought of using header paint, which also has a high heat range. Hopefully, whatever I use will not be affected by brake fluid on the paint.
I have used Eastwood stainless steel paint in a pint can. I like the finish of that, and have used it on the heat exchangers on my old Porsche 914. It seemed to withstand heat and actually cured as it was heated.
Thanks again for your feedback.