keep in mind, if you're stroking the engine out, you'll have to clearance the block for the rods, and, you have to have a machinist do that so that its perfect and there are no burrs or anything.
I personally would have a reputable shop do all the machine work. Putting the pistons in, putting the crank and bearings in...etc...you can do yourself.
Also, the engine 1993 and older were known as the LA motors. 1994 and newer are the A engines, or the magnum engines found in our trucks and in some Jeeps.
They're basically the same, but, the way the heads bolt on is different.
Also, call a cam company and tell them what you want. A cam can make or break an engine build. Sometimes a mild cam will net you better performance then a monster cam depending on the situation.
You're building a 408 stroker engine...a 360 already has a very long stroke, so, its not meant for high RPM, its meant for low end to mid range grunt. Keep that in mind when buying parts for it.
Also...forged internals aren't neccesary. Cast cranks and pistons are capable of withstanding up to around 700hp. You're no where near that, so, this is an area you can save some money.
Now, if you're planning on supercharging it or anything down the road...there are a few things to consider so that you don't have do redo anything.
You may want to keep the compression fairly lower (8.5:1 or 9:1), and, you may want to have forged internals and good headgaskets/head studs.
Also, with a supercharger, you want a cam with less valve overlap...keep that in mind.
However, if you are planning on staying naturally aspirated for years to come, don't worry about that previous paragraph