The risk is that you will fill your coolant passages with bits of WP impeller which can clog passages and cause a cracked head. I vote flatbed.
While they are in there I would consider a fresh 160 T-Stat and motor mount, check and replace idler pulleys and belt as needed. Not very much more labor involved when you bundle these jobs. Ask your indy to bill for time on the job instead of book rates. Most will accommodate you when bundling related jobs.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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