is it worth installing cam in stock 318?

edelbrock performer cam .420 int/.420 exh. You already have the intake, all that stuff was designed to work together. I had the performer in my 87 .5 ton pickup and it ran real good with the intake too. My truck had 302 casting heads though, which are better than the old ones. Cam and lifter kit is reasonable in price too. $152.95 from summit. I didnt change my springs either. $.02