Hey doc I was looking at your block page and was wondering what I have and if they are good blocks to build for pro street and show. The block numbers are 2205630-2 and 2202843-2 . I also have a 76 duster slant but cant get to it to see the numbers right now. both these blocks are out of 60 - 61 valiants. The finished will be going in my 61 valiant 2dr. post .

I need to do some looking for those block numbers, they are early ones.
Have you looked at the water by-pass hose or the ID pad to see if these are 170 or 225?
http://www.slantsix.org/articles/sa-franks-book/pg2.jpg

I like the 5 freeze plug blocks, 68-76 the most but the ones you have will be OK if they are basically good castings.

Take a look on the right side of the block for more engine ID info.
DD