1/ thinking of swapping my v3 heads and putting them on my RWD v1 Kreg will they fit as a swap,can i still use my v1 inlet.?

2/ can i put JDM big port heads with avs on and use my v3 inlet if not what have i got to do

3/ v3 heads are ported with cosworth cams +1mm ex std inlet .what differance will it make with the jdm heads .i will be using new heads and cosworth cams ect