The 606 has dual cams so it will be a little more work and expense but otherwise OK. I've done a 603 head, should be similar. Don't pay very much for the car, you can buy one in good shape these days for $2500. What is the condition of the transmission? 350K is definitely rebuild territory.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970