[Nintain]

Like many other owners, my 2015 scion frs valve spring broke and punched a hole into the valve head cover. I'm currently disassembling it to swap to a brand new factory oem short block but I've run into an issue. In the car manual for disassembling the engine, it states for when removing the timing chain, tensioner and guides that you have to turn the crank to where the two cam arrows meet or else it might cause damage to the valves. Well my issue is that my crank won't turn very well because I'm assuming there is metal aluminum bits stuck in the cylinder bore to where it won't turn. I don't plan on keeping the the old short block if the solution requires me to deeply damage the bore. What would anyone recommend, would removing the timing without turning the cams to the correct position damage anything? I appreciate any advice

Note: I do plan on taking apart the valve head to inspect and replace springs, guides and retainers