400 big block

thanson_mopar said

exactly, its about $1500 if you want the rotating assembly ballanced. bolt on a set of ported cast iron heads do a little ignition and oiling upgrade and seeing 550hp is not out of line. I talked to the guys at the 440 source back when i wanted to put a big block in my duster, they know what they're doing, great prices.

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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.