www.ws6.com has some pics of his old LT1 PP and so does brent. They both look diff than your. The one i pulled out when i did my new motor looked just like yours but my clutch and PP had been replaced earlier in the cars life. I have heard all aftermarket PP's are the LT4 design. I have heard valeo only makes 2 PP the LT1 and LT4 the LT1 has ribbed fingers.