The Owatonna parts book lists both 13 and 7 psi radiator caps for the torque convertor and 13 psi for the variable. No mention of thermostat that I could find. The Ford parts book lists the thermostat as 155 and 160 (Ford C5JZ-8575-B) degrees for all years. If you cross the Ford number, it crosses to Stant or Gates 180 degrees. Napa lists the 160 degree version as line code THM part number 18.
Your FLAPS will carry a combustion gas leak kit for about $50. I've used them with success in the past.
Good luck,
Al Jones
Brookings, SD