You should look at the Whiplash Cam from Hughes....It's made for low comp stock type engines.....Has a nasty idle to it....From the video they have it performs pretty well in the guys stock 340.....
I agree, heard good things about those cams in low compression engines, The MP .509 just has too much overlap & dur., Not that you can't make it work, But IMO, you'd be better off & much happier with a cam designed for lower compression.