There is a guy on E-bay sells complete engine kits for 413 in forged!
do a search

http://www.ebay.com/itm/Chrysler-V-8-413-CID-Master-Engine-Rebuild-Kit-1959-1965-/330752615997


http://www.cleggengine.com/chrysler-v-8-413-cid-master-engine-rebuild-kit-1959-1965.html


this guy say he has forged kits
http://www.flatlanderracing.com/rebuildkitschrys.html


this guy sells 426 kits a stock bore 426 piston will work that is just a .0625 over bore on a 413
http://www.ebay.com/itm/Dodge-Plymouth-4...e#ht_2734wt_759