Opinions on heads please?

Gonna be building a 450hp range 360 soon.

I currently have '71 360 J Heads with the 1.8"/1.6" valves(rebuilt about a year ago) on my 318.

What would be better to do? Buy some aftermarket heads like Edelbrock Performer RPM or Indy heads......or have these heads rebuilt for the larger valves? About how much would it cost to get them set for large valves and maybe a port job? If you can give me some typical price breakdowns that would be awesome. Thanks.

This will be a daily driver with 1/4 mile passes about once a month(maybe less) just for fun.

-Alex