If you change the car to a big block you'll have other costs... Heater core, heater core cover, motor mounts, motor mount stands, headers, modifying exhaust, bellhousing (likely), trans cross member, etc. If you want to keep the build a tad more manageable, you could run a 427 small block or even a 383 stroker. GM Performance Parts as a great 383 stroker that makes good power.
Dan
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