I have a 1982 Mercruiser 470 #6180420. It seems I have coolant leaking from the front of the motor. Looks like I need to do a repair on the seals and camshaft. Got that. Question is: is it still safe to operate for a little while? I don't think it's been leaking long, but I need to do some trial runs to check out some issues. Is it safe? Can I run at high rpms? Or should I "shut it down" until I can repair the seals?