Don't know. The person I bought it from bought it from the guys who built it. Unfortunately no receipts or info at all. It has an Edelbrock hi rise manifold, 750 Holly & headers. The cam is so aggressive that I have low power brake vacuum. It is very fast and gas mileage is in the single digits (not too high). I'll check rpm at 60 mph this week and ask the forum what the axle ratio us.
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