If anyone has run this set-up which rods and jets did you use?

The engine runs but when I stop on a hill or have a heavy load it dies. Am I running a bit too lean? I figured someone must have run this set-up at one time or another and had it dialed in.

I've tried adjusting the A/F mixture and also changed out the step-up springs with no luck. My next project would be to change out the rods or jet combination.

Also, when the car is put in drive the idle drop considerably but I checked for leaks and found nothing. Could this also be a symptom of running lean?

PLEASE HELP!

58 Ford Custom 300 - San Pedro, CA (So-Cal)