The very FIRST thing I'd check is for corrosion in the fuel line...usually the pick-up/sending unit sock.

Next, as said that cam is in way late for a heavy car....105-106 would be where I'd put it. Actually with a HR a single pattern 239 in at 102-103 would be even better. Lunati's are notorious for requireing Degreeing from my experience, never trust the factory ground-in advance without verifying it.

Also I agree the pre-load may be tight, try backing them off 1/4 to 3/8 of a turn from where you got them. if no improvement tighten them back up. I set them at 3/8 to no more than 1/2 and never had issues and my 517 turns 6800 with a (Bullet) juice roller.

That's not a lot of stall for what you have, I like about 3400-3600 FB/stall and 4200 flash for that combo. with what you describe you should run a very low 12 or even high 11 without too much trouble.

Check the fuel line first, corrosion will choke that thing down big time, People have brought me cars that had all the goods but wouldn't fall out of a tree....I pulled the fuel pick-ups where I was amazed it had enough fuel flow to IDLE, let alone take full throttle under load