Used to be a company called Kaufmann Products that manufactured all types of swap kits.
Seems like www.kaufmannproducts.com is no longer around.
Maybe this will work?
From fordracing.com
Ford Racing 429/460 Engine swap kit for late model Mustangs
Seems like www.kaufmannproducts.com is no longer around.
Maybe this will work?

From fordracing.com
Ford Racing 429/460 Engine swap kit for late model Mustangs
<font size="2" face="Verdana, Arial">I would also check out some Mustang forums...460 Fox Engine Swap Mounts
PART NUMBER: M-6038-A460
VEHICLE TYPE: Mustang
Use in 1979-95 Mustang and other Fox-chassis cars to mount 429/460 engines. Our rubber insulated mount kit is designed to work with M-6675-A460 rear sump oil pan kit and custom headers.
Does not fit I-6 cylinder front crossmember.
Not legal for sale or use on pollution-controlled motor vehicles.
460 Fox C6 auto transmission only