[rwhite65]

Well, after searching the internet for some time, It seems this is a very unpopular swap. Sorry, could not find any info that dealt with a 390 in the car. I did however read where a set of hooker headers will work for the swap. You may want to call them. Modifying the headers is not all that bad, I have full length headers in my 65 with and AOD. Took a little bending, but they work.
Ryan