years ago I ran a couple 440s with the 320 Isky cam,
that cam had 320 duration and 525 lift and I liked the fact that I could just put that cam in and run stock rockers and never had to open the valve cover up all season(I really don't like adjusting rockers).

I planed to run the 509 cam that I have with the MP stock rockers but liked the specs on Comp cams XE285HL
and when I seen that articular with the 383 they put stock rockers on with that cam and got 450HP out of it with stock heads I thought a 440 should be around or over 500HP with eddy heads.

thanks guys for the ideas and opinions, guess I will have to think about it a little more. Ron...