I have one in my 1978 4X4 Ramcharger. 440 + .030, 9.75:1 compression, 3.55:1 gears, 29" tires, 1.6:1 rockers and a 2500 convertor. Not really a good mileage around town cam but sounds great and makes plenty of power in the higher rpm's. Pulls about 10" of vacuum in park and have no problems stopping with power brakes.