Opinions on carb and manifold setup

Thanks for replies guys. Thanks for the PM's too. RRR, you asked some good questions and made some good comments. I called the prev owner and asked if he degree'd the cam, he said yes.

What am I expecting? I guess I'm expecting much better jump from a dead start, the wheels barely squeal, I would expect better (I'm allowing the stall too). This is a light car and with the 426 (and described components from the previous owner) it should smoke. I have had the car opened up on a rural road, I'm able to get the rpm up to over 6000 which I would expect with the described rear end. Something just isn't right, it should be much better. I'm thinking the carburetor.

Based on the specs and what I know of the owner it sounds like he knew what he was doing. Improvements were made over time for the better.

Here's what the previous owner gave me (of course I know I have to verify everything - which I intend to do).
Engine 1964 426 Wedge - verified by casting number and date stamp
Bored .060 oversized
Stage IV heads ported by Motorsport Performance, Addison IL - Verified casting #3614476
Cam mechanical lift .557 - Isky?
Pistons Forged TRW - 12.5 to 1
Windage Tray
High volume oil pump
8 qt Moroso oil pan
Carburation Holley Avenger - Confirmed #80870 870cfm
Trans HD 727 with reverse manual shift & shift kit - Cheetah valve body from Mopar, BM shift kit
2800 stall converter HD flex plate
fluid damper - front balancer
Springs SS with extra main leaf added
Pinion snubber
Radiator -BeCool
Water pump Alum - Summit
Heavy duty front torsion bars - ordered from Mopar made for BB conversion
4:10 sure grip read end - 8 1/4 mopar sure grip
Estimated HP over 500
Estimated ft lbs of torque over 500


As I said without the documentation / receipts I have to verify the components.

????