I also have a '67 Coupe with the L6 200ci 3.3 litre engine. I just had it boiled and I am going to have it bored out to .040. I plan on also puting a V8 into it much later in the future but I would go with either a 289 or 302, to make it easiest. Once you get into the 351's you start having to change the steering system and you have to adjust the shock towers if you want to put a 351C into it. Hope this helps.