Shell #1 cam vs XS Performance cam specs? Anyone

I'm looking but haven't found the specs for a Shell #1 cam, vs these specs for ths XS perf cam, I found these on Mikes XS. Can anyone help, advise;

XS Performance cam
TIMING SPECS
Timing at .040"Lift at Valve
Timing to be checked with zero clearance
see running clearance - lash below
INTAKE EXHAUST
OPEN 26 Degrees BTC 60 Degrees BBC
CLOSE 66 Degrees ABC 32 Degrees ATC
VALVE
LIFT: .420".420"
DURATION: 272 Degrees 272 Degrees
LOBE
CENTER: 110 Degrees 104 Degrees
LASH OR
RUNNING
CLEARANCE .006".006"
(Cold)
XSperformance Cam Kit for 1974-84 447/533 type XS650 Engines
( 36 tooth cam sprocket )
Part # 05-0025 Sold as a kit Only as shown above
XS #05-0025 XSperformance Cam Kit Includes
Cam, Performance Valve Springs and retainer kit
and premium valve stem seals ( 4 )

From what i have heard the xs cam is a pos. There was a few reviews on it.

The specs for the Shell #1 @ .040"

IN open - 29° BTC
IN close - 49° ABC
EX open - 49° BBC
EX close - 29° ATC

Duration - 258°
Lobe Center - 100°
Lift - .405"

I have heard of issues with the hard facing wearing quickly on these cams. I believe it is a copy of the megacycle 30 series cam , check out megacycles site and their cam specs, they also offer rd valve springs and adjustable sprockets.
See here.

Ask Hugh about the mikes cam, said he never could get it to run right with it.