To start, vehicle is a 1983 380SEC 194K.

I have two available engines, one still in the car a 1984 500SEC (M117), 120K and a lone engine, a Euro 380 (M116), unknown mileage, unknown car, rebuild sometime in the past.

Now, not worring about the unknown of the 380 motor, based just on specs what should I put in the car? It's not a daily driver and is going to be just for fun, a rice hunter and even possibly some autocrossing.

What I know (or think I know) about these two engines so far

Current 3.8 US M116: 155HP?

5.0 M117: 184HP?
3.8 M116 Euro: 212HP?

I forget where I saw these numbers at the moment but they're exactly as I saw them.

I'm getting a different set of specs from wikipedia- which is a little confusing because it lists the 5.0 M117 anywhere from 220-269HP and the 380 engine as 201HP. It doesnt say what years or versions these numbers are from (4 different ones for the 5.0 alone). Does anyone have known correct specs for these engines?

So....what would you do?

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350