Cam for a 360 build with the parts i have

Hi all,

I know there is a ton of 360 build threads, I've been looking through them. But I cant find exactly what I'm looking for.

I have a 360, 904 74 Dart Sport.
I'm am currently fitting 8 3/4 with 3.7 ratio. This will require a convertor change so while I'm at it I may as well liven up the engine.
The 360 is running J heads, MSD, an unknown Mopar cam and a 770 Avenger.
I plan to use the bottom end that is already there. It has been rebuilt in the past.
I have on the shelf a new set of RHS heads & air gap manifold which I want to use.
So that brings me to cam specs, this is always confusing for me.
Any recommendation for me? 450hp+ is the target.
Thanks.