Please dont be offended Antti but I think maybe your RR figures are a little optimistic?
Standard rods and bolts will not take 270bhp........ at least not for long! lol Plenty of people have had them go below 250bhp!
Same goes for a standard gearbox, mine sheard teeth off at only 190bhp and I wasnt being harsh with it, just put my foot down in 2nd and off they came!
Also if you spark table has not changed since you emailed me your map then IMO it's very retarded and would struggle to make 270bhp, there could be a lot more power to be had with another 8 or so degree's of advance

Just my thoughts though.........