Thanks for the tips, I'm planning to remove the head during September to look at the gasket and at the same time the state of the head. Anything I should look for except warpage ? I'll probably have to change the gasket and do a leak down test to be sure it's not cracked ? I've seen aftermarket head on internet, still debating if I should give this engine a second life if I find something bad. If I can determine that the engine is still worth it I'll be changing for a Weber carb for sure, just for the satisfaction of removing this spaghettios of vacuum lines...