The C8AE-H heads are pretty much the std FE heads used on everything except the 428CJ/SCJ and 427. The same casting as the later D2 truck heads also. With some port work and bigger valves a decent flowing head. I've never seen a set of the C8OE-H CJ heads either. I've had the C8WE-J and C8OE-N heads tho. The 406 was a 62.5-63.5 option only so the C8 heads would not apply to the 406. As far as crank numbers the 428,428PI and 428CJ used the IU and IUB crank. The 428 SCJ used the IUA crank. 390 cranks can have a 2U or 3U number or a full casitng number if early enough. Some counterweight differneces are present from the early to later 390 cranks. Post the number you find off the crank. The 428CJ website you posted is a good one! It's a long time fav of mine with a really good forum too.

G.