This is looking even more and more appealing since you can get a pair of those hemi heads all rebuilt for just under $1000. Although I do see the reference to the coolant flow modifications needed seeing as the bottom of the heads look like swiss cheese. Theoretically couldn't you drill and tap the block and head to run external lines to reroute coolant and oil to where it needs to go? As long as you don't weaken the casting of coarse