The Yak said:
A 351c and 351m are the same block, the only difference being the deck height. The heads will interchange between the two, as far as I know that's it. The bore and stroke are also the same.
As far as I know no parts will interchange between the 351w and 351c.
I don't wish to jump into a pissing match with you but,your education on Ford engines will continue a bit.
The heads will work on a windsor block, that IS how a "302Boss",was built.The 302 block used had 4 bolt mains on #2,#3,#4 main journals. Moroso did sell an intake designed for the 351W using cleveland heads, called it a "Street Boss" intake.
351C/351M/400 are from what is known as the 335 series engines, and as you say are pretty much identical-externally. Main bearing diameter is much larger on the 351m/400 engine, 3.00 in, versus 2.75 on a C engine.You cannot use a C crank in an M engine,or vice-versa without major grinding.
Now the fun part; you can put a 400 crank in a 351W engine by machining the counterwieghts down, then you must have rod journals machined down from 2.31in. to 2.213in.,which will allow you to offset grind the journals and gain .045in. more stroke, so now you have instead of a 3.5 stroke a 4.045 stroke, bore the engine block .125(svo block) and get a 432 c.i. small block, or bore .06 and get 419c.i. You can also have the crank welded up to produce more stroke when offset grinding. From what I have seen about .125 is most you can do, and that requires a GM connecting rod.(441c.i.!!)Torque number would be very good at around 425 lb.ft., hp should(could) get up into 500 range on pump gasoline.
The cost would be around $2k for a smooth quiet streetable, dependable engine
I ran a stock bore w/400 crank 351w for a couple years on the street, and doing autocrossing, very smooth and scary.