[tbirdtbird]

"In the 70's I locked up 2 engines"
Tom, that seems odd. To what do you attribute this ?

And to the OP, please do not put raw water in that block, use 50% antifreeze. You have enough rust in there already. ppl forget that antifreeze has an anti-corrosion additive. But, yes, put antifreeze in the block and be sure to leave the fan belt off. And whatever you do run for no longer than 1-2 min. If you must run it this way at all.