Well with nothing to go on it is difficult ,
4 types of cams hyd or solid in flat tappet or roller .
Stay away from Comp they are a poor choice or Mopars .
I prefer the Lunati VooDoo series, they produce great results .
I have no clue if you are running a manual with or without Overdrive , 4 speed is much more forgiving , what gear ratio in the diff , tire size , mostly used for highway or city , what intake you pan to use , I like the 300-14 Holley Street Dom intake , it seriously kicks ass . Headers or manifolds make a big difference in the cam grind used , ported heads or aftermarket ? they usually will flow better with more lift . Will you race it , autocross or drag or ...
I used a hydraulic Isky 270 mega in a 440 years back and it was an absolute stump puller with 3.23 gears. As I recalled, we were able to use the factory stamped rocker set since this cam doesn’t have a ton of lift on a smaller base circle Like a bigger cam would.
Granted it’s not as sexy as some of the other stuff out there and you probably won’t win races but it idles good without shaking parts loose like an old Harley, pulls enough vac for power brakes and has enough low end torque to destroy a set of tires if you just want to cruise around and light em up once in a while.
And it will keep your build costs down since you will be able to reuse many of the stock HP stuff like heads, intake, Exh manifolds, rocker assembly, converter, etc.
You need to be really honest with yourself about how you plan to use the car. Lots of guys want a bad ass idle but then complain about the lack of smoothness and drivability and after it’s in and they’ve spent $8k on the motor, they discover that all they really wanted in the first place was something to cruise around in and take the family out to the car shows.