I have 1969 SS convertible, 396 4-speed. The engine is a 325hp L-35. The partial vin is correct on the lower part of the block as well as the engine numbers on the front pad. My question is when the engine is sent out to the machine shop, if the block is decked and the engine numbers are removed will this effect the proof I need to prove originality? Or will the partial vin be all that is needed.