When I was building my 350 a few years back I ordered my engine kit online. It had three options for cams. So I just picked the biggest one. Today I went back to the site to see what the cam duration and lift was because I'm going tbi and needed the info when I get my new chip burnt. Now the site list all kinds of important info with each cam. My cam specs read: Comp Cam 12-210-2, 1500-5000 Rpm, 268 Duration, 454 lift, Valve springs must be changed, 2500+ stall required and not computer compatible. I've been running this engine for about 4 years and didn't "change the valve springs" or run a 2500 stall. Will I have to buy another cam to make my tbi work? Should I be running a stall? Can my chip be burnt to work with this cam. Should I have my valve springs redone? I had the heads redone at the time of the rebuild, but I'm running a factory tc. What would you do? FYI I don't pay anyone to do anything other than machine work so I'm not taking it to a mechanic.