since someone linked to mbturbo.com and are talking turbos in a 107, and mentions the 5.6 liter v8, another friend had a c107 with the 5.6 from a 560SE,
he got 730whp in that beast with two larger turbos,
you could ofc just put one on there to, and get plenty of power.
he did that on stock internals.
althou i think he thought about going for the cams from a 380SE since they had better lift/duration or something like that.
450SLC 5.6 TT in 80km/h 3rd gear | Mercedes-Benz turbo
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daily: w123 om602turbo 5speed 200whp, w115 240d 3.07 differential
mbturbo.com turbo diesels+gassers in oldtimers/classics