First i hope this is in the right tread if not i know im going to get flammed. I have a 91 teg that im doing a custom turbo kit for. Wondering by me have a b20 head on my b18 block if thats really going to make a differences with my kit. Only reasons i have it is becuase the guy before me blow the timing belt so he had a b20 head and put it on.

 

No it wont matter

it will only make it sweeter

 

shouldn't matter.
the heads are the same. the cam might be different depending on which b20 it is.
but you should be good to go on turboing it.