Proudlakester, there have been some problems lately with Felpro intake gaskets getting porous and letting
oil get sucked in from the cam valley into the intake ports...maybe a change of intake gaskets would be worth a try...use Victor 95159N for meduim risers and Edelbrocks and 95158N for low risers, 25-30 bucks at Car Quest or NAPA...a lot easier than pulling/overhauling a motor!
On which route to take, I think I would go with the 428 rebuild and the "quickie" swap (LOL), that way the toy is down a minimum of play time, and you can take your time on the 427...heck, you may not even want to put it back in...