I had a 390 in it to begin with but I'm putting that motor in my Dad's '67 Galaxie. I will build a 427 MR over the winter for the cobra.
Chuck

'04 ERA Cobra (will be) 427 Toploader
'67 Galaxie 390 TKO-600
'66 F-100 (patiently waiting)
www.chuckbrandt.com