I have a 4.25 crank with the 2.20 BB Chevy Rod size and journals.

It's pretty close on the oil pump pickup (within .050) and it still easily clears the bottom of the bores with no issues.

I put together my own "kit" using Molnar crank, 7.1" rods and Mahle pistons. It balanced really nicely with just a little weight being removed from the crank. It was also cheaper than the source kit and utilized, IMO, better rods and pistons.

The Molnar stuff is very nice and dropped in with no fuss!