For a project down the road....I am contemplating using a Lincoln Mark VIII engine. How well does the crank hold up on those? Should I go for an aftermarket, or is the stock one decent enough?
Not sure on these motors but if the internals are the same as our 4.6 internals the crank is not your main worry on weak links it would be the rods and pistons. That is if the internals are the same as ours.
If you want 700-800 hp then I would advise you to look into a complete forged rotating assembly modularmustangracing.com has some decent prices and good kits.
Also I hope you know this is not a cheap game to play not only are you looking at mods to support the motor like rotating assembly, fuel system, but also your drivetrain is not gonna last on that much power. I see in your sig you got some suspension mods but you also need to put in mind what it is gonna take to get this power to the ground in suspension, and your drivetrain upgrades to hold up to the power you are putting to it.