V8 swap- parts list? 66 signet, 225/904 floor shift
Here's the manifolds you will need.
http://www.forabodiesonly.com/mopar/showthread.php?t=273752
There is a story out there that some sixes came with V8 center links but I have never seen one so you will need drop center link.
You might want to modify your trans cross member unless you go with single exhaust.
I did this swap 3 times. Last one was last spring so it's pretty fresh in my mind. Pretty easy. Did it in one day AFTER getting everything together. Dennis