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Brenspeed lowers the compression on the 302. Swapping the 289 for the 302 alone wont net you any gains.
You are correct they do drop the cr 9.5 from what they told me but the stock 4.6 is 281ci. the same rotating assm is avail in a higher cr of 10.4 you may could get brenspeed to build you a shortblock with higher cr cp pistons its around 400 hp in a NA settup with comp 127300 cams same engine as is in the Parnelli Jones Saleen 302 u could prob get more power than that with the correct tuning Saleen tunes are conservitive .
I am supercharged so I was thinking about my setup when I replyd first time