Do not use a 509 cam in a low comp engine you will make the car a pig I would concentrate as stated on heads and engine dist running all the total I could get the car to run/ start with in normal fashion Run a hyd cam of around 480-490 lift keep the centerline at around 112 Good intake and exhaust If you can try a 350 horse from late 60 early 70s still around and cheap if still in a car. Do not pay any attention to the Mopar bible for total timing limits of 36 or so Give the engine all it can take and back off when she barks. Run a 650-750 dbl pumper 650 for throttle response 750 if you can for overall power and drag racing.
Have fun and just do it !
You dont think 509 cam even with 4.10 gears and 3000 stall?
If you have the 509 that's one thing.
If you have to buy, then get the 108LSA 484 if you want to run a mopar hydraulic cam.
The 509 might make more power in the last 500 rpm and it's not going to be by much. The 484 will pull the midrange better. Especially if you advance it a bunch as mentioned earlier.
I'd run a Lunati Voodoo 60303 or 60304 cam before the Mopar cams.
