March 73S with a DFV?

Does anyone now if a March 73s was ever raced with an engine such as a DFV or a chevy engine as I have heard of such a beast (but it probably is a 75 or 76 car ) however the owner is adamant that it is a genuine 73s with a dfv, any ideas please ?
Thanks

Don't remember about a 73S, but there was a DFV 74S, sort of a semi-works car, driven by Brambilla (works F.1 driver), Brian Henton and others...

I also don't think a 73S ever had a bigger than 2-litre engine. There was the Mike Coombe 74S as fausto says, and the Edwards 76S, both with DFVs. Any with Chevys, I can't recall any?