We have a 1987 300d with a rebuilt 603. the mechanic working on it wants to put a head from a 350 onto this 300. He said it was "beefier" and more "robust".

Is this good, bad, or ugly?

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg