400 big block

To get that power, it's much more than that. Brandon has decent product, and very good pricing. But there's a lot more to it than tightening a few bolts and firing it. The dead simplest is the 440Source B wedge 3.75 crank, rods, and pistons in a 400 block. Then it's a bolt in "build like a factory engine" deal and the cost is similar. The 3.915 stroke isnt that bad. Any bigger than that, and things get harder and more expensive in B wedge block.

Not impossible, and yes there is more to it than bolting on a set of heads, i guess i wasnt going into detail about it. the 451 is great but for the same price you could upgrade to a size or two bigger. The main thing is doing a little machine work in the block so that theres no clearance issues with the crank(unless you use the 3.75 inch crank, this will drop right in as moper said). It can be done, ive seen it, with a street driven car with reliable (as a big block can be) horsepower. If i remember correctly it was apr. 556 horsepower to the flywheel. I know for sure that all these diffrent stroker kits from 440 source are the same price, wheather you want a 451 or a 512