There are different ways. One is that the 351w fuel pump bolts to the timing cover,the 351c bolts to the engine block. Water flows through the 351w intake manifold and does not on the 351c. The 351w has inline valves and the 351c has canted valves. The 351w has squared intake ports and the 351c has huge round ports. Hope this helps some.
It is a 351c bored 60 over with 6 inch rods and a .4.0 stoke.
They are all good engines but the m is not a powerful engine. The 351c code R is considered by most to be the most powerful but there were low power models built which was Code H. The 351W is an entirely different engine than the 351C even though they are the same size.
In good condition you can expect to pay $250. There are deals out there if you can find them but this is a good little gun and quite accurate also.
How much horsepower is 439
how much hp is 140cc
About 6.5 hp.
how much cc's is a 6.5 hp engine
110 HP
1000 hp
About 27 hp
17 hp