An EV-13 isn't that different than an EV-27. It has a 236-I/248-E duration and a .485 lift for both intake and exhaust.
The part that makes the noise is the lift, if over .500. You're OK there. The part that WE'RE talking about maiking noise is the cam GEAR LASH with the PINION GEAR.
What color is marked (paint dot) on you EV13 gear?
What color was the mark on the stock cam (gear) that came out?
Those colored spots should match. If not, it could be too loose or too tight. They match up to the pinion gear, which is below the cam, on the crank.
The colored spot indicates the diameter of the cam gear. Ad stated, you can swap gears from the stock to the Andrews, if need be, rather then spending $200+ for a matched set of gears, or another cam, or about $90 for another pinion gear.
The other issue is your cam shaft end play.
Aftermarket cams require a shim to be placed over the rear of the cam prior to installing it. Using a caliper, measure the length of old cam from the front of the timing gear to the forward most area of cam bearing area. Measure the same length of the new cam. The difference should be between .050 and .060 inches. A shim of the proper length is required. If no caliper is available to measure the cams, install a .055 cam shim at rear of new camshaft. This is generally the correct shim to install.
According to the Moco manual, end play should be .010-.050..and if my memory serves me Andrews reccomends .010-.020.......
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012