My DIesel 300 SDC is safely tucked away in the garage waiting for spring, the car is 99 % finished.

I have said this before if you are swapping in a motor and trans from a 83 300 SD, this is a very easy swap. The manual trans made it much harder.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D

I wonder if a 606 will bolt up to the 722.4 that the 603's does? If so you could probably slide that combo right in without having to do anything radical.

Then you would need a Myna tweaked 603 IP, and some other go fast parts.

I wonder how much it would cost to screw 400 rwhp out of a 606? That would make a pretty fast SEC.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200