I'm thinking I put too small a cam in my 360 Magnum...

Summit's web site says that cam is not in stock.
I’d probably go with this one, then. I definitely wouldn’t want to wait for them to grind one to get to me. This wouldn’t need the Rhoades fast bleed lifters, either. The only issue may be the close to .540 lift with the magnum 1.6 rocker arms.
Howards, Hydraulic Flat Tappet Camshaft, Chrysler SB 273-360, 220/220 @ .050, .506/.506, 108 LS - Competition Products