Erson cam specs??

I had no idea what was in my 340 so picked this Ultradyne solid mechanical cam up from a fellow A-Bodies Only member and was going to install it. (cam specs on Ultradyne 485" lift, 238 @ .050", 272 @ .020", 110 degree lobe separation).
You guys think I should make the swap or continue to run the Erson:dontknow:
My 1969 340 is mostly stock as far as I know but will also be getting an RPM intake, Holley 750 dp, Mopar electronic ignition, Hedman Headers with 2 1/2" Pypes exhaust and I am running a 4-speed. Heads have an 'O' by the spark plugs not an 'X' or 'J'