360 push rod dilemma

Thanks to all for your help. I've decided to upgrade to the standard 5/16" x 7.5" prods. No marks on the pistons however the cylinders are worn so I'm having it bored to 40 over. I haven't started the rebuild yet but I do find it interesting that all the exhaust side valve springs have spacers under them. I 'll measure the installed height once I do the assemble to confirm they are needed.