440 Camshaft recommendations for up to 6-6,500 rpm?

Purchased this Dart with a 440 with a Mopar purple for idle to 5,800 (as per the engine shop). Was thinking of going with something to get me into the 6-6,500 range. I know that will sacrifice a smooth idle and depends on heads and valve train. Specs on head and valve-train when I bought them are:
915 heads port and polished,
105# at installed height 1.80
300# at 1.25 .550 lift
coil bind 1.10
good to .600 lift
I an not an expert on these calculations. Any suggestions as to what would work best to get me into a higher rpm zone? Purpose = street and informal timing at airport strip.

The Mopar 0.528 cam will pull well past 6000 rpm in a 440 if the top half of the engine is up to it. Those 915 heads will need to be professionally ported and you'll need a good intake as well as a good exhaust system. I tested a bunch of cams in my low deck 470 years ago. That engine had HP exhaust manifolds, RPM heads and a RPM intake. It would pull to 7000 on the chassis dyno but peak power was down around 6000. Here is an article on the tests: Moparts on the Web - Main Index

Here is the test car on the chassis dyno. It pulls well past 6000 rpm without a big cam. This is with HP manifolds, not headers.