20v BT - which oil pump?

[Mylesmck]

Hi folks!

I'm rebuilding a 20v blacktop for my AE86. Was wondering what is involved in changing to the silvertop timing belt/tensioner, as I understand it is less problematic than the hydraulic tensioner of the BT. Also, the timing belt is about half the price of the blacktop. I have two oil pumps; the original BT pump (engine spun a bearing so it would be no harm to discard that), and a 16v type - which looks very clean & may not have seen much abuse. I also have a new genuine pump gear set.

Is there anything I need to be aware of when doing this? Also, the previous tensioner was welded/brazed onto the dowel on the pump but I've since ground that off and the dowel came off with it!