Need advice on used engine

Hey guys I just recently bought another 225 slant for my sedan from craigslist. Unfortunately, in my haste, I didn't realize all the differences between it and my 1970 225.

My car runs alright but I wanted to start building another engine for a boosted setup. So I bought it for $190 with an A903 3 speed. The engine # is 2463430 which means it is a 225 RG from 1966. My car is a 1970 Dart Custom Sedan with an A903. I realize my torque converter will not fit, which is fine since I wanted to have one built. I won't be using the 903 but instead keeping my 904. I noticed the spark plugs don't sit as deep into the head as mine aswell. Is there any other differences that may pose a problem for me when trying to use this? I've searched and haven't found much in the way of differences, and there's quite a bit of conflicting information on the various forums I lurk.



Don't mind the stand I built for it, needed to get it off my hoist since the wife has almost run into it twice. Thanks in advance guys for any help!