You can make it a side fill. Tanks Inc has a mustang tank that has a bolt on neck. If you get the 70 degree neck and some 2" tube and elbows you can make it a side fill like we did on this 1950. This is a Camaro tank but the idea is the same. The 69-70 mustang tank is a 22 gallon, 64-68 is a 16 gallon. The OEM replacement does not have a bolt on neck only the EFI version do so you would need a carbed pickup and of course a sender. If you go with OEM mustang you end up with a bottom pickup and sender that you need to convert to your gauges and the fill does not bolt on. If your interested in the kits we have for this swap email me.
info@thoroco.com