yep thats the stuff i have evaporust had a old 396/375 hp this was before my hot tank . even with a hot load in the tank it would of not help much .it was very bad. i stuck the block in two HD garbage bags tape around the bag s put a drip pan under the block then fill the block up with evaporust . it did not do what i needed it to do the block ended up getting shot blasted it was very bad with a lot of pits fresh deck and bore clean it up good. but the block was getting bad.it was setting on the timming cover side down in a old shop with a bad roof pitted up the front face and rusted off the timming cover pins . i think you will fined that evaporust and your molasses mix is about the same .about 15 years ago i had some 454 block came out of a scrap yard we played around with some muratic acid you could get it to eat rust .but i ever could get it to stop rusting the block up .i have used metal prep that work ok on small spots