I have moved away from putting a 455 in my 65 skylark and am going with a 401! Its kind of a cool looking thing! What kind of performance will a set of headers and some minor porting on the heads add? I plan on hooking this thing up to a 200R4 and a 3.08 posi rear, looking for more of a cruiser that race machine, so I think it should cruise along nicely!