i pulled a 440 out of a 67 Chrysler Imperial Convertable years ago and stuck it on the shelf. It has a rebuild prior to me purchasing it it was an old mans car i bought the car directly from him. can some one give me some advice on this engine. On the block up front there are markings it shows C 440 then below that 12 5 . On the passinger side of the block it shows a stamping 7 11 66 then 2536430-5 . I am hoping to give this a go through and would like to get more HP out of it with out loosing drivability. I have not removed the valve cover to check on the head stamp as of yet. Thank you in advance