318 build

ryan1964 said
Ok so I'm build a 318 stock bore flat top pistons new bottom end either a 454 lift cam or a 480 lift summit grind 4 speed is putting 360 J heads on it going to help it or hurt it

Flat top as in stock or (near) zero deck aftermarket ? Hopefully the second one.
What rear gears ?

Got links to the cams or just copy paste their specs here.