DGrace I’m going follow along I’m in the same situation. 400 block standard bore I have the steel eagle 4.150” crank. Headmen b body headers and a edelbrock dual plane intake. I need everything else the rods and pistons likely will be the 440 source stuff. I joined the facebook page 500 inch mopars these guys know their stuff. I had the same concern you do with the short skirt piston and oil support rails. But that’s what makes the build awesome because you have 500ci with half the weight of a 440 piston that revs to 7500rpms. These nuts are running them on the street from 650-800hp. Also follow justMoparJoe YouTube channel look for his playlist for Dave’s big block 500 stroker it’s the same build we are planning he makes some steam with this build. Good luck
I looked at the Eagle kits with the 4.15 crank to see what pistons they use (one said Mahle) but no info..... The pictures showed no oil ring supports required but it may have been a generic photo....? Not overly concerned with being able to reach high rpm's, although the lighter weights would be good.....