"Once it warmed up, I found a small crack in the block that weeps some coolant so for now no long trips are planed."
I am going to tell you about an old mechanics tip for a cracked/leaking cast iron block. Go to a pharmacy that has an older pharmacist, not a young whipper-snapper, because I can not remember the pharmacutical name. Tell them you want the product that smells like rotten eggs that old timers used to seal a cracked block. The seal is only considered to be temporary, but the last time I did this, the Jaguar was still on the road 5 years later. I am only offering this temp solution to ease your mind on a longer drive and you said it was slight.
