Find out how bad the rust is in that cylinder, you also need to know what existing the bore size is so you know if you can clean it up by boring or if it will need a sleeve Try sqirting some liquid wrench(not WD40 ) in that cylinder several times, take a wire brush or wire wheel on a drill motor and knock the heavy rust out of and then see if you can beg,borrow or buy one of the glaze breaker cylinder hones to smooth that bore up so the piston will come out Go from there. Do you have access to a competent crankshaft grinder? If so you may want to have the crankshaft offset ground to BB Chevy rod journal size and stroke the stock crankshaft to 3.91 stroke KB makes several really good sets of forged shelf pistons in different compression ratio for that combination using a 7.100 long H beam BB Chevy rod for the 440 blocks That combination ended up being quite a bit cheaper than using the stock Mopar size forged steel H beam rods and stroke on the last bracket motor I built for a customer Check it out before deciding, you may save some money and make more power Sorry for the rusted cylinder, been there done that