408 stroker rod bolt interference?

a little clearance job would be ideal. It should be simple enough with a die grinder or dremel. I would test fit all the pistons and mark the block as appropriate rotating the crank a few times. Disassemble, have at it and then clean everything. If you can control all the metal shavings best you can. Containment or vacuum. Stock rod bolts probably would have cleared just fine but you got the good stuff they protrude out a bit more.