I went through this on my 71 250C that also has the M130 six.

First head was warped and already planed down to min thickness, so I couldn't use it.

Replaced the entire engine with another from a sedan, then a year later had the valve stem seals go. This head, while not already planed or warped, exhibited significant galvanic corrosion and water jacket plugging.

Chuck Taylor sent the head to Metric Motors for weld buildup and we were able to save it.

My experience on this engine to date is to expect additional problems once the head is off. Be prepared to see the anticipated cost at least double.

Jim

__________________
14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles