HELP. Can anyone help me with something im going to do. I have a 65 mustang coupe with a 6-cyl. 3-speed trans. I also have a 1970 model 390, and i want to join the two together and have a unusual fe pony.I know that in 67 the 390 would fit but not sure about the differences in the engine bay.If there is anyone that can help me with any suggestions i would greatly appreciate it. I only gave $400.00 for this mustang so i can afford to spend a little on it.pic is attached.