I think a good starting point would be a set of aluminum heads. Any of the big names should work well; Trick Flow, Edelbrock, etc. Another that I'm going to give a shot on my Fox convertible is ProMaxx. I've heard good things from other members here as well as good reviews on the net.
The SBF Maxx 180 is an as cast head that beats the competition. Don’t let the size fool you, flowing over 260 cfm, this head makes real power. It puts out up to 20 hp over the competition.
promaxxperformance.com
I don't think any of those heads would have an issue supporting your horsepower goals with a pretty mild cam.
As for an intake, assuming you're staying carbureted, I'd suggest an air gap style dual plane, either Edelbrock or the Pro Comp piece that I have should work well. Pair that with a 600-650 carb and all should be well in the world.
(Of course, I'm a little biased... I'm basically suggesting my engine!
)
Given all of that, you can check out the specs of my build through the different threads in my signature or clicking the following links, most all of the info for my engine build is in them, although it will take some patience to sort through them.
https://www.stangnet.com/mustang-forums/threads/pro-comp-24026-intake-manifold.883603/
https://www.stangnet.com/mustang-fo...-holley-4150-tuning-exhaust-escapades.915742/
https://www.stangnet.com/mustang-forums/threads/so-i-did-a-thing-today.913231/
The short story: I have a 68 302 block, crank, rods, flat top pistons with 4 valve reliefs, Trick Flow Twisted Wedge heads, Pro Comp air gap style dual plane, 650 Holley double pump, and a Melling RV style cam with 1.7 roller rockers. It produced 265 horsepower and 300 lb/ft torque to the wheels in November 2019 with a VERY rich carburetor.
Another 302 that produces similar numbers in a different set up would be
@MustangIIMatt 's car. Maybe he'll chime in and give you a recommendation.