@rwd4ever, interesting project, have you or will you post more info as you progress? The 3.5 has a shorter deck height than the 4.5 (shorter stroke) and is easier to fit in the car, less width to clear other things in the engine bay. I am not looking for big power, that's another endless quest, reliable and tractable my goal. That said I do like the sound of revs.

Todd, I do intend to try the compensator but am thinking a 109 rear anti roll bar with a transverse shock (no leveling) as an option to try as well. That said when I did the Carrera in the 356 we carried all our spares and clothing (including toothbrushes and underpants) in the car with us on the stages (since the race goes from city to city) so maybe load leveling isn't a bad idea?

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1968 230 W110 +3.5 M116 & 4-Speed Manual
1985 300TDT S123
1985 500SEC C126
2022 Sprinter 3500