What intake to look for??? Stock 360 crate motor

Give me some ideas??? I have found another 1968 barracuda w a 360 in it. Motor supposedly was replaced by insurance Co after a fire in mid to late 90's. I haven't had time to check everything out yet. It does run.... But is a dog .. running really rough right now ... Get this It has the original 273 4 barrel manifold on the 360. That can't be working good . I need some advice on an aftermarket intake only going to be driven around town but needs to run good