You can have the 440 crankshaft ground using a offset stroke to 3.91 by going to the BB Chevy rod journals and using the 6.535 longg H beam BB Chevy rods with a readily availble low cost forged piston from KB (Kieth Black brand) pistons in several different compression ratios that can make a 464 C.I. using a 4.360 bore with the 3.91 stroke or a 470 using the 4.375 bore, that combination is very potent, revs quick and doesn't cost a fortune