i need an adapter plate to bolt a small block chevy to a 78 ford 4v4 (original 400 motor) transmission ive heard they make these but i cant find one ANYWHERE please help if you can

I would ask the hot rodders that have done this before. A google search is the best place.

Most people that I know use the chevy transmission too, but keep the ford rear end.
You can either use a custon drive shaft, or custom u-joints

id put a chevy tranny and transfer case in if i could but then id also have to change axles since the transfer case shoots the front drive shaft out on the wrong side that would get costly id rebuild the ford 400 but parts are INSANE 300$ for a edelbrock intake jesus...built my chevy motor and paid half that not to mention i dont have it in anything rgiht now

Try Hotrodders.com.
They have an incredible tech forum on several car related subjects, and a lot of people that have done simular swaps