how does the HB fit when you put it on the crank? On mine the balancer took a lot of abuse and was way oversize. The new balancer (PNP part) fit pretty snug so I redrilled the crank for two new pins 90 degrees away from the first two. My original holes were really far gone, not sure how bad yours are from the pics. Its all up to you and your capabilities. Another question is how long did the PO drive without a water pump? I thought my HB failed a second time and in my anger I drove it 4-5 miles to get off the highway to a good tow spot with no water pump, I was sure it had failed again and I knew I couldnt redrill it. Turns out the pulley bolts came out the HB was fine, but after driving so far with no water pump the engine does not sound right. SO I am now in the process of putting in a $300 donor engine with less than half the miles and good history

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)