engine swap question

The easy question first. Yes ,Chrysler made a 413. Personnally I would go with a 440 before a 413.

The 360 should drop right in as long as you have the correct K-frame and mounts. After that there are a few isues to deal with such as, radiator, fuel line, heater core hoses, vacuum hoses. I am not sure on the wiring, maybe somebody else will chime in. You also might want to consider a stiffer torsion bar. Also there is the exhaust to think about. The throttle cable should work, I use a /6 cable with my 360.

Jack