hy to you but i am sorry to inform you that in israel ARE ONLY 2 GENIUNE RS TURBO !!!!
your car is xr3i with rst engine
one is 1988 - red
second is 1989 - white

the red is mine if you need any help pleas feel free to contact me at 054-4976909

about the cvh 16v head if you will pay ~10000 EURO you will have one
schrik from germany built 3 16v heads for testing now only left 1 head and it's in germany on rs1600i bottom end and that produce about 180 hp
according by owner of the car

later i will post some pics