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The greatest probability is that your engine is a 351M. Below you will find some identification information compiled by Torque1st:
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The 351W and 351C did not come stock in 73-9 trucks. Some of them have been "transplanted" tho.
Engine Identification:
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351C/M/400 335 series: 8 bolts in rectangular valve covers. Timing chain housing is part of block. Thermostat housing on block. Exhaust bolt holes diagonal.
351M/400 335 series: intake is 12.7" wide the 351C is narrow.
351W/302/5.0L 6 bolts on trapezoidal valve covers. Thermostat housing on intake. Exhaust bolt holes horizontal.
429/460 385 series: 7 bolts in rectangular valve cover
352/360/390/427/428 FE series: Intake goes under valve covers.
There are other indicators but these may help.
Last edited by firstonraceday; Aug 6, 2005 at 08:27 PM.