So sometime in the late 50s, early 60s Chrysler wanted a car that could be run in a 5 liter class, so they built a 301 poly engine and offered it to the general public in the body they wanted to use. This was a short stroke 318 poly. The only change that you have to make to use it in an LA motor was it had an 8 bolt crank like a hemi, so you needed a hemi flex plate or what ever the conversion is for a 4 speed. In the 1980s a machine shop that I used made dirt track stock car motors out of LA motors with these cranks. Since no one builds polys to speak of these days you might find one cheap. I believe they were forged cranks.
