Heads, Intake & Carb upgrade...

I do have a line on a 360 magnum for $600..
That will be the best money you can spend. She already has over 9/1 Scr, already has great heads for your combo,probably will not require an overbore, and already has a pretty good cam, for your application.
If it's in good shape, you won't be sorry.
If she's wore out, even better, cuz now you have the perfect excuse to bump the pressure up.