I would first try to re-torque the bolts to 35 ft lbs and see if that takes care of it. I had a 273 and the bolt angle of the 273 heads is different than the 318,340 and 360 heads. They are bad about leaking oil so I had to but a little bit of RTV sealant on them to keep from leaking. The previous owner didn't know that and I had oil leak from under the bolts. I have never heard or experience it myself of coolant leaking under the intake bolts but not saying it couldn't happen. I put some RTV sealant on my 360 intake bolts even though I was told that I didn't have to... paranoid I guess but it doesn't leak anything. It didn't hurt a thing on mine so I don't see why you couldn't do the same.