340 crankshaft value

One good the about the 340 I acquired , it appears to be the first time its been apart , I know it was sitting for last 20 to 30 years in my friend's garage , so if it is indeed STD and the crankshaft is in good shape I may use it , going to wait and see what the shop tells me about the crank as far as cost and condition , if I don't like what shop says then I will by a new forged steel crank and not the $350 , the seller did say it had not been used since the work was done but few things about it I don't like that some already pointed out , the difference in the rods to main bothered me as well , I appreciate all the feedback