Johnny,
Maybe time to agree that normally aspirated is never going to get the job done with this 170 cylinder head on a 225.
That's what we're up against,
From the heads flow numbers I've seen 145cfm stock and 185cfm ported I can't imagine making more than 175hp with a stock head and 200-225hp with a ported head with a reasonable cam and CR, what's the most someone got out of a full race N/A /6 on gasoline? 280hp maybe 300hp? The OP'er only wanted the same hp as a 175 net hp 360 so you need to build 200-225 gross hp numbers above so that would be larger valves, ported, milled for 9:1, 264 cam, 500cfm, headers, stall and gears.
