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Jonnylightening said

Solid Roller Cam. Good high performance street cam with good mid range torque and HP. Works well in 318-360 c.i. motors. Needs 2500 RPM stall converter or 4-speed transmission, header, 9:1+ compression ratio and 3.55+ gearing. Lopey idle. ; Advertised Duration (Int/Exh): 261/267; Duration @ .050 (Int/Exh): 231/237; Gross Valve Lift (Int/Exh): .555/.566; LSA/ICL: 110/106; Valve Lash (Int/Exh): 016/016; RPM Range: 2400-6400; Includes: Cam Only

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IMO
this might be too much cam for a lo-compression 1977 318, in a streeter. 9/1Scr at 200ft elevation is already chewing up your cylinder pressure, requiring IMO more than a 2500TC with 3.55s.... Forget it if you are at 1000 or higher.
The advertised duration has no qualifier, so your seat to seat could be vastly more, and that would kill your cylinder pressure, turning you engine into a Jeckle and Hyde personality; namely a dog until say 3500, then coming on strong at the top, peaking at around or after 5200, then rapidly descending into a pit, I'm guessing.

The take-away is this;.
I highly recommend that you NOT order a cam until you have determined your EXACT compression ratio.