I've got a tall deck big block chevy at 4.350 bore, 520ci. After two seasons there is a slight ridge at the top of the cylinders. I've been running steel top rings napier second. The pistons will rock a bit in the bore. I'm wondering if I should give it a slight hone and new rings or replace the block. What's the max clearance I can get away with and what rings should I use? 16-1 compression, injected Alky (M-5) and 300 shot fogger with C-12.