Which Block?
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For a Miata, I would try to stick to an aluminum block. 600 rwhp is a shitload of power for short wheel based little weigh nothing go-cart like the Miata. You going to put a chevy automatic trans in it? 5.7 w/ a TC76 is a well proven combo that'll get you there easily.
The Best V8 Stories One Small Block at Time

