Building any brand engine in the 540 cube range to the 1000hp NA is going to cost about the same in the long run. SBC to not even near that level, even more (and you would need 2 or 3 to get thru the season). A roots blower might be less but would still need very good heads, a turbo setup would make way more than 1000 hp for same money(as 540) with less cubes and less head work.
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