Run your measurements though a calculator. Compression will really depend on how far the piston is below the block deck surface. Most are about .005-.010”, but I’ve heard some are closer to zero. A stock bore engine, piston .008” below deck, 58cc heads, -6cc valve relieve pistons and a .037” head gasket will put you at 9.4:1. If the short block is in good condition it will last just fine without a power added at that compression.