Poly to LA block swap questions

One other place you might look is in heavy equipment. I used to work on forklifts and saw them in bigger Hyster forklifts. They probably were used in Yales too since Yale and Hyster are partner companies. I used to work on a 58 Hyster SC180 regulary that had a Poly 318 in it. Don't know if you have any forklift junkyards around you but if you do that might be a place to check.