Hello, I want to add some oomph to my 440. Will this cam work with bone stock heads & valve train (other than a 3 angle valve job)? Or will I have to do some mods to the heads anywhere, such as springs, etc. I am trying to avoid machining or new heads, etc. I am looking for guidance on the fitment, clearance, etc, not carb, headers, axle, converter, etc. Thanks in advance.

if your compression is decent, it'll do fine. mine was zero deck, around 9.5:1 comp with stock 906 heads, and it felt like an honest 450 hp, with lots of low end torque...easilly spun the tires from a 20 mph roll with 3.21 gears.

I swapped to eddy heads, closed chambers... which sent me to about 10.5:1 and went to an engine dyno, made a solid 500 lbs of torque through the RPM curve.

I doubt your springs are up to it!
Stick with a stock cam

Im using that cam in one of my cars. Great cam, nice manners and pulls to about 5600. You will need to trim the valve guides down to prevent hitting. The cam has aggressive ramps. I went with dual springs and adjustable rockers. You can probably use a single spring with it. I tried using the stamped rockers had nothing but problems.

Thanks guys, that is what I needed to know.

I run a lunati voodoo 60303 with stock rockers/pushrods on 440source heads with absoloutely zero issues. However when comparing duration vs lift, the voodoo lobes are slightly less aggressive than the comp lobes.

However, to run the comp 275, I think you will have to machine your heads to be able to run an aggressive enough of a valve spring. If you want to keep the cost down, I know you can run the big summit cam and you can put springs on that will fit stock heads without machining. Also the lift with the summit cam is a bit less so you do not need to trim valve guides.