I looked for the casting number on the block near where the oil filter goes on and couldn't find a number. I also looked under where the starter would go if that was bolted on but I couldn't find a number. I did look at the heads they also had a C8AE casting number the rest of the number was unreadable (he had them sandblasted and whoever did the blasting got a little carried away it looked like). The heads are off of the motor and he measured it to be about 4 inches in bore but he used a tape measure so I'm not convinced on how accurate that is and I didn't have my calipers with me at the time. At one time he said he measured the stroke on it too. He told me they were just about 390 numbers but it's hard to get real accurate with a tape measure. I never thought about checking the crank for a number but it was covered in crap since the oil pan has been off it for ages it looked like so it might have been hard to find if it was someplace I could read it. I'll have to take some tools to do some better measurements next time I head back to visit the parents. If this turns out to be a 390 what do you guys think it's worth? It's a locked up block with stock heads. I was thinking of offering him $100 does that seem like it's in the ballpark of what I should be offering? I've been out of this stuff for about 6 years and don't know what price range I'm looking at here.


Also one more sort of related question will an 390 fit into a 67-70 mustang without too much effort? What about a 429? My dad has a 429 someplace that came out of a gran torino gt that is already stripped down ready for machine work I might just use if I can find it. ( He used to run an engine shop and still has about 20 blocks sitting around so it might take a while to sift through them all and not all of them are still at our shop, a couple of them are at a shop belonging to a friend of his)