Most SUFACE rust issues like on the deck surface and in bores is not a problem, but if the main bearings are out and you have rust there that is pretty good buck to hone and or worse bore and then hone out of there!
Also anything more than surface rust or too much taper in the lifter bores will negate the use of that block.
A block from 72 to mid 74 will have a tad thicker cylinder bores and hopefully have less miles than a 68 motor.
Go to the Butler performance or Kaufman performance site a get a rebuild kit from them once you know how much and over bore and what bearing sizes you will need once a machine shop does a check out of the block you use.
Many times in the shop I use to work in I wold get all the rust off a block top to bottom by tossing it in the bead blast cabinet, but not before duct taping off all of the oil passages, even in the lifter bores!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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