When we looked into it, we found that the blocks are exactly the same size for the 287 and 327. Obviously the pistons were bigger on the 327, but we put flat-top performance pistons in it, and a guy from another town around here bored it out 1/4" and said everything was great. The crank had to be fixed up a little bit, but other than that it went together smooth and everything. We ran it on the stand for about an hour and it sealed up and everything, so we sent it out the door. I'll have to ask the guy if I can get the casting number from it. I don't think he's got it in the car yet. I believe he's waiting until harvest is over before he does that.