I used crushed glass, 60 grit, worked great.
Wash with soap and water after blasting, rinse with clean water, dry for a day, then SPI epoxy, then flex epoxy repair, then more epoxy for block sanding.
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Michael
Oshawa built 1 option Judge basket case. 463, SD KRE 295's, CNC'd factory intake, Cliff's Qjet, Stump Puller HR cam, RARE RA manifolds, Pypes exhaust, T56 Magnum, McLeod RXT clutch, 3.42 12 bolt. 24 year project almost done... 
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