340 vs. 440? (Help)

who and of yall. I and u have proved nothing. we and may I get feeed back or replies. me am old and seeing this a body and a ? I look at this site. I and any one asks if I am not a member. I am sorry I have parts and Aar MOTORS I have owned and have mancini has asked me 4 the mancini has sold me a body bigblock partas I own some of the rare parts mopar ever produced.