I've used and built 5 or 6 of the 413 industrial and or marine blocks for race cars and street cars I use only the blocks, crankshafts and some of the fasteners depending on which heads I'm going to use
The last one is going into my 1963 Plymouth Fury with a Mopar brand 4.100 stroke crankshaft in it, 7.100 long BB Chevy type Molnard brand rods. I had either Autotec or Diamond make the pistons for it for pump gas using 440 source 80.0 CC heads.
I had the 413 crankshaft offset ground to BB Chevy rod journal size and increase the stroke to 3.91 and used that crank in a later model (1976 casting) 440 block for another pump gas motor with 440 Source heads