Ok guys, one more question: I fillet my radiator up with AF yesterday and when I took a look at it this morning I had a very slow drip. After chasing it down I found that the AF is coming out of a bolt hole on the block low on the driver side rear of the engine (straight down from the no. 6 exhaust port). The hole is threaded, but I don't recall taking anything out of that hole.

I suppose I should tell you that its a 1959 235. Anyone have any idea what is supposed to be there? Or is it more likely that I have a crack or something? I'll post a pic as soon as I can.