If you had a big enough container to submerge it in water you could use Electrolysis to remove the rust from the block. Just need a tub, some water, Arm and Hammer laundry soda, a metal rod, and a battery charger. Actually works pretty cool. Follow the link below for a tutorial or search youtube for videos.
http://rowand.net/Shop/Tools/Electrolysis.htm
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1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi.
Everything installed, fired up and tuning has begun!
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