400 block is it cheaper to buy stroker kit

He's putting a 440 crank into a 400 block.

Don't forget about turning and polishing. The 440 crank has to be turned down to fit in the 400 block. Plus you're not using the same rods that came with that factory crankshaft. Nor are you using the factory pistons. Lots of weight difference with those two things involved.

I know, I just built a 457 using a factory forged crank. The mains were ground at a crank shop, but I turned the CW's on a lathe in my own shop. You could do this with an angle grinder if you're careful and your time is of less value than cash $. Or a mill for that matter.

Using Icon pistons and Manley rods, I still needed to take more weight from the CW's after I had plenty of clearance for the crankcase. I recall BW was around 2340'ish, the Manley rods were BBM journal and were not that light.

Taking weight out of your parts is good, that results in a remove balance job, it's adding weight to parts that gets expensive, like going from an alloy rod motor back to a steel rod motor.

I wouldn't put any money into cast anything at this point, save maybe simple refresh type of utility build for a work truck or industrial application. S/F....Ken M