I can't find this cam on the erson site. says on rear of cam R314-460b 324-445 4-7 swap and 112+2LC. there is also 0307 and 573v engraved on it also.It was in a 555BBC with dart 345 heads. I'm wondering if I should keep it or go with something else .

I would call Erson & ask them.

https://www.pbm-erson.com/contact

2BKING

This is from AI:

The Erson R-314-460B (also referenced as the R-314/460-B) is a specialized mechanical roller camshaft for Big Block Chevy (BBC) engines featuring a 4-7 firing order swap.
The "4-7 swap" reconfigures the standard firing order from 1-8-4-3-6-5-7-2 to 1-8-7-3-6-5-4-2. This is done to improve air/fuel distribution in the intake plenum and reduce crankshaft harmonics for better mid-range power.

Engine Specifications

Cam Type: Mechanical (Solid) Roller
Firing Order: 1-8-7-3-6-5-4-2 (4-7 Swap)
Advertised Duration: 314° Intake / 314° Exhaust
Duration @ .050": Approximately 284° Intake / 288° Exhaust (varies slightly by specific revision)
Gross Valve Lift: .712" Intake / .675" Exhaust (with 1.7 rocker ratio)
Lobe Separation Angle (LSA): 114° (Standard for this series)
RPM Operating Range: 5,500 – 8,400 RPM

John Hartman has always responded quickly to my emails and been very helpful.

jhartman@pbm-erson.com