I changed mine for bosch 4 years ago, it is a cleaner burn (I think) when it was on the rolling road it made 281 bhp and over 300ib/ft, there was a bit of head work and 4.8 cc.
something I found out was that this engine really needs negative pressure in the crankcase, a small vacuum leak can cause the eco to enrich the mixture and make the CO reading high.
David Byrne
