Steve,
If you're prepared to go internal and pocket the pistons, then the set-up RAN has on his car would be ideal for you (you'll need Iskey's on the K2 side as well)
.
Should release around 380-390 bhp
. Beyond that, you really need the next step up in injector size
.
CosRush,
Based on 13 years of experience of Cosworths
and 6 different engine specs that I have personally owned. Any tuner of Cosworths (worth his salt) will tell you how good the standard cams are. Any tuner advising you to fit BD10s, either has excess stock and wants shot
or hasn't access to an engine dyno to see what these cams do to the mid-range
.
The K2 cams for a Cosworth are absolutely awesome, but with nearly 11mm of lift, need the pistons pocketed and Isky valve springs. For any car aiming for 400+ bhp with a T34, these would be MY cam of choice, as they give a fantastic spread of power.
Beyond that, I'm not prepared to divulge my tuner's engine dyno experience with cams / timing, as he has spent many hours getting this information, and it would be unfair to give it out willy-nilly.