advice

First, where is your timing set?

Have you recurved the distributor?

Did you set the accelerator pump linkages to .015" clearance. Lack of this adjustment can make it sluggish.

The 80457 is a nice carb. I've run them on 318's with 340 cam and 2.76 and 3.23 gears with stock converters. Your carb is just fine, you just may need to tune it in.

Set your timing to 34 - 36° BTDC @ 2000/2500 rpm.

Next make sure you set the accelerator pump clearance.

Get the Holley secondary spring kit and put the short yellow spring in your vacuum secondary pod.


For your application, I would prefer the Wiand Stealth intake. The action plus is made for a spread bore, the stealth is for a square bore. Your carb is a square bore.


CHRYSLER SMALL BLOCK ACTION +PLUS INTAKE MANIFOLD
PART #: 8007

Installation Notes
Square bore Carburetors may require
plate P/N 9006 to seal properly. Rotary
A/C compressor will not clear on 1978 and later applications.


Features
High Rise Dual Plane Design
Universal Mounting Flange
No EGR Provisions
Power band: Idle-6000 RPM
Height: Front 4.88", Rear 5.94"
Port Size: 1.96” height 1.00" width

View attachment Wiand 8007 Action plus lg.jpg

http://www.holley.com/8007.asp


CHRYSLER SMALL BLOCK STEALTH™ INTAKE MANIFOLD
PART #: 8022



Installation Notes
Rotary A/C compressor will not clear
on 1978 and later applications.


Features
High Rise Dual Plane Design
Square Bore Carburetor Mounting Flange
No EGR Provisions
Power band: Idle-6800 RPM
Height: Front 4.88", Rear 5.94"
Port Size: 1.96” height 1.00" width


View attachment Wiand 8022 Stealth lg.jpg

http://www.holley.com/8022.asp


Then use this gasket:

BASE GASKET
PART #: 108-18

Features
Fits Holley Model 4150™, Model 4160 and Model 4180™
1 9/16" Throttle Bore
.204" Thick

View attachment Carb Gask Holley 108-18 lg.jpg


http://www.holley.com/108-18.asp


I don't care for the carburetor adapters to convert from spreadbore to squarebore or vice-versa.

I feel that it's best to use a manifold that is made with the proper flange.

The stealth also is rated for up to 6800 rpm, where the action plus only goes to 6000 rpm where both 'start' at idle.

Then use a gasket just like the one above with the dual plane (split) down the center to keep the plenum all divided up to the carb base. This will keep your low end torque. With the 5/16" thickness, it also helps insulate the carb from heat of the engine/intake. This will keep the low end torque that the intake was designed for.

If you don't keep the plenum divided and use an "open" gasket with no divider, you loose some of the low end torque that the dual plane provides. The squarebore to spreadbore adapter may loose some of that low end torque that you are looking for.