Nov 16, 2021 · A Dart intake manifold and two Quick Fuel 1050s sit on top. This particular 635 cid big block Chevy engine produces 1,450-1,470 horsepower normally aspirated, which gives customer John Kitterman a mid-to-high 4-second, 1/8th-mile ‘68 Nova. He races the car in the Summit series as well as for bracket races.