I have a custom cam motions hydraulic cam and brand new CamMotions springs/retainers/locks for trade for a suitable LT1 Turbo Cam. This cam of mine was in my 355 LT1 for about a year. After I tore down the 355, I sent this cam to Cam Motions so they could inspect it and verify that it is in perfect shape. They did so and verified it's in perfect shape. If you need verification from Cam Motions themselves, I'll give you the invoice number and contact info at CamMotions.
The custom cam part number, verifiable again by CamMotions, is : X2291-2391-12, Core: 5310010
4 degrees advance built in.
Lobe Separation = 111.9 Cam degrees
Valve overlap.... = 14.1 Crank Degrees
(Assume 1.6 rocker ratio)
Intake:
------------->valve open.....: 9.1 BTDC
------------->Centerline......: 107.9 ATDC
------------->valve close.....: 43.1 ABDC
------------->Duration@.050: 232.2 Crank Degrees
------------->Lobe lift..........: .35358 In.
------------->Valve lift.........: .56573 In.
------------->Lobe area.......: 28.8 In * Deg

Exhaust:
------------->valve open.....: 56.7 BBDC
------------->Centerline......: 115.9 BTDC
------------->valve close.....: 5 ATDC
------------->Duration@.050: 241.7 Crank Degrees
------------->Lobe lift..........: .37146 In.
------------->Valve lift.........: .59433 In.
------------->Lobe area.......: 30.95 In * Deg

The Spring set is CamMotions part number 723030. To see the spec's, installed height, etc on these springs go to this PDF and use the PDF search for '723030'. http://www.flowbenchtech.com/porting...ion%20cams.pdf
The brand new 10 degree split locks are on that same .pdf. Look for part number 891000. The brand new retainers are steel and match up to the .pdf part number 894060. If you want pictures of the cam, springs, retainers and locks, let me know.
I paid $275 for the cam and $232 for the springs/retainers and locks.

The ideal Turbo cam would have specs akin to the following...
Duration (intake/exaust) 228/228
Lift (intake/exaust) 563/563
Lobe Center Separation 114
Intake Centerline 110

Thanks,
Dave