ask the guy if he had it balanced before putting it in so at least you will know if it was neutral or not. Ive now had 3 flywheels neutral balanced and all were off by 20 grams or more. if that doesnt sound like a lot, it was two 3/8 dia x 3/8 deep holes on the edge.

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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)