How do I identify a(n) (aftermarket) cam?

[NO SLO PK]

It's easy. You can connect a vacuum line to the black plastic vacuum tree on the firewall. There should already be a 3/16" port with raised letters that say "T/R" or "B/R" (I don't recall exactly). It's covered with a rubber cap from the factory. Remove the cap and slide a vacuum line over the fitting. Connect the other end of the line to your gauge. Start engine, take reading at idle.

These are the directions for an 86-93. Not sure what year yours is.

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Russ L
'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.