Afternoon Doc, I've just joined this forum and plan to start (as it looks like you did) on the road to owning a GT40 with an engine build. And like you, I'd like to make it as close to original for the GT40 Mk 1 (i.e. SBF) as possible. I've seen what you've done - can you point me in the direction of the original engine specs, if you found them? I appreciate that I'm unlikely to get matching castings etc for reasonable money, but if I can find something close, then I'd be happy. I've just sold a 67 Mustang that I did some engine work on (it also had a 289) and with only a small amount of work I was getting 230bhp at the wheel. I'd like to go further this time! Thanks in anticipation, Kev.