AI aircraft sounds

I didn't know if this was the right place to post this question. If it gets moved to "scenery" I'd understand.
I'm replacing the default AI jet aircraft with some four-engine prop airliners in an effort to re-create a 1958 version of Love Field. I'm using some great AI models from Tom Gibson's California Classics site. Well the new AI planes don't play the jet sounds of the AI planes they replaced, but they're playing the engine sounds of a Cessna instead of the big prop sounds I thought I was linking them to.
Any suggestions as to which config file needs to be changed in order to get these prop liners to sound right?
I'm replacing the default AI jet aircraft with some four-engine prop airliners in an effort to re-create a 1958 version of Love Field. I'm using some great AI models from Tom Gibson's California Classics site. Well the new AI planes don't play the jet sounds of the AI planes they replaced, but they're playing the engine sounds of a Cessna instead of the big prop sounds I thought I was linking them to.
Any suggestions as to which config file needs to be changed in order to get these prop liners to sound right?