patrick wrote:In short, my friend, DON'T DO IT!!!!!!
One thing's for sure, especially this side of the pond (well, your side of the ditch, actually), you won't easily find another car if you change your mind afterwards. You've been through all the hardest parts, including the bodywork, reassembling everything, so I'm sure a simple mechanical failure, as aggravating as it may be, is not your only reason. Might be the last straw, though, I can understand that.
I don't know how the car stands in your life, family-wise and health-wise, and you're the only one who can call the shots on that, but I can say this :
winter is probably not the best season to sell this kind of car, you might wait till spring (except if someone here or at the MMA who knows your car springs at the opportunity).
What's the problem exactly with the head, is it cracked, did the porting go too deep and vibrations did the rest ?