I'm am working on getting more power out of my 1967 220ci 6. So far I e put in a pert robin ignition kit and a dual exhaust header. I was going to put on a Webber car with a converter but I'm waiting until I decide what to do about a new head/intake. I'd like to do a cam, bore the engine over 30 and put a new head on it. The aluminum heads are too expensive for me and I am wondering what my options are for heads out of a 250 or for doing work to the head that I already have? Is there much that can be done to improve the one that I have and then possibly have the intake milled so that it takes a 2 barrel carb or should I just be looking to get a head off of a 250 block. If I do a head off of a 250 what years will work and what will need to be done to it to make it work? Thanks for any advice.