1966 Corvette 427 & M22 Trans

[Viper69Z28]

Aloha guys I need some help buying an engine & transmission out of a 1966 Corvette.1st is the price,The guy wants $3500 for the engine, pan to heads.He said that it is a 425 horse engine with rectangle port heads.What are the letter codes to look for on the engine block.Next is he said he also has the M22 from it & said he wants $1500.First question,On the trans is does it have the C designation on it, if not how do you tell if it is a M22.Also is the pricing for both in the ball park & also I would like a M22 That makes the loud noise.I know this one has the small output shaft,But does it make as much noise as the 1970 M22 with the large output shaft.My friend had one & it was very loud .Any help would be greatly appreciated Mahalo Irvin