440 source

I had a set of Eddy heads on the small block I used to run. I disassembled them to inspect. I would recommend it, only need a valve spring compressor tool. The valves/stems were all in excellent shape. Then checked for dragging of the valves in the guides.
By mixing and matching valves to guides for best fit ended up with only one guide that needed to be enlarged ever so slightly; did it by hand with rolled up 600 grit sand paper rotating the paper and moving up/down the guide to create a cross hatch honing pattern. The springs met specs, retainers and keepers all good stuff too. The rocker arm geometry was very good with Comp rockers. Ran the set up about 4000 miles on the street with no issues. Then sold the engine. Just my 2cents.