An IF of 1700khz when the reciver was designed was
outside the AM boradcast band, now it isn't. So a
higher IF is advised. Microprocessor clock crystals
are available in a huge range of frequencies from
various sources usually for under $1. A good starting
point is 1.8432Mhz but the list of available crystals
is generally long and lots of choices.
JDR micro www.bgmicro.com
and others are cheap. Digikey and Mouser generally
have what you want but you will pay more.