New mech cam/not removing in spring tricks?

I would remove the inner springs, your right. I had a comp 306 magnum solid flat tappet go flat and I had done everything right except remove the inner spring. I would also use the zinc/sulfur additives that are out there. Flat tappets aren't what they used to be and need all the odds stacked in their favor. I kick myself because I had to replace the cam, lifters, the oil pump, and the rod and main bearings. It was about a thousand dollars and a huge amount of work for my brand new motor that had about 20 minutes of run time. I was so bummed and frustrated that I pushed it aside for 3 years and didn't get to enjoy the car because of my own laziness. Please do all the pain in the *** steps you wont regret it. Oh as a side note the .557 is a great cam and you wont see 800hp more from a cam change but you will see 20hp, maybe, and 20hp from milling the heads, and maybe 20hp from something else and then it starts to add up. Competitive racers will tell you that it is usually the little things that add up to make a combo the best it can be.