Tjac-
The "W" means Windsor, the foundry factory where the engine was built. The "M" stands for marine. The M engines are marine engines. There are also 302C and 351C engines, which are Cleveland engines. They use a different block and heads. But I believe the Windsor heads will fit on a Cleveland block.
The 429 is called the "385" series of big block engines. Ford made three different 429's - passenger engines , Cobra Jet, and Super Cobra Jet. The first is pretty clear. The CJ used 2-bolt mains and a steel crank, and the SCJ used 4-bolt mains, and a bigger cam. I also believe the SCJ had larger intake ports, and larger intake/exhaust valves. Finding a SCJ engine is a little harder and more expensive than the passenger or CJ engine.
A 460 is nothing more than a stroked 429. The bigger the stroke, the more torque the engine will produce. 429's were great for Mustangs, but lacked the torque needed for trucks. 429/460 engine components are interchangeable, except for the Boss 429, which used hemi heads.
I'm currently building a bored/stroked 460 which will displace 532 cubic inches. And yes, it will fit in the FFR Roadster, albeit it will be tight.
You can get 429's from various salvage yards, but you would be better off going with a crate motor from Ford. They make two 460's (486 HP and 535 HP), complete with aluminum heads.
Hope this helps
2FAST
[ November 21, 2002, 10:43 AM: Message edited by: 2FAST4U ]