Approximate horsepower

I have a hard time seeing make less than 450 hp, even running 27 or so less degrees of cam and .05-.100 less lift than most, lesser stock LS heads can do 500 hp with similar cam with a 5.3l. A xe262h cam with stock magnum heads should be able to get mid-high 300 hp can’t see why trickflow wouldn’t get way much more than that.