This is from the 1957 Chevrolet Light Duty Truck Service Manual. Here are the engine specs for the 235, 261, 265, and 283
Torque specs are:
main cap bolts 100-110
bellhousing bolts 45-55
flywheel bolts 50-65
rod nuts 35-45
oil pan corner bolts 12-15
oil pan bolts 6-7
clutch pressure plate bolts 25-30
cylinder head bolts 90-95
manifold clamp bolts 15-20
manifold end clamp bolts 25-30
water pump bolts 25-30
spark plugs 20-25
fuel pump bolts 15-20
rocker shaft bolts 25-30
1955-57 Chevy Car and Truck Windshield Wiper motor description
1947-67 Chevy Truck SM420 Transmission