my combination
I have the mods in my sig. I went the Edelbrock way, fuel injected. There are many other cams on the market now that out perform the Ford alphabet cams. I love the way my motor performs though. But I'm naturally aspirated so I'm only making around 320hp probably. A long ways away from 400-425. If I could do it all over again I'd definitely go with the AFR heads though. They make gobs of power. Not sure if they will give you the horsepower #s that you are looking for though...maybe if you stroked it?? Good luck.
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