Getting a smallblock to rev

Now I'm wondering, if we can make up for cubes, with rpm ,
Yes you can, but your main limit is gonna be cylinder heads 273/318 aren't
the dog heads everyone makes them out to be but if you can't port them with 9:1-10:1 CR and a high lift 268-274 cam your gonna get 300-325hp @ 6000 but with 11:1+ CR and 284+ cam 325-350hp @ 6600, without porting 350hp will be your max power, if you can fully port add 100hp and a 1000 rpm to those numbers. If you can swap 340 heads on CR will be your biggest problem.