as said just use a standard one, think some people have found the standard pinto pump is exactly the same and u just need to swap the cossie pump cover over as it has the hole in it for the spray bar!! I fitted a 4x4 one to mine as i was advised 2 but sounds like it wasnt really needed!!

Rest is a peice of piss as said if u have worked on an engine before!! its just making sure ur tollerances etc are spot on ie using a plastigauge on the bearings to make sure their clearance is fine etc etc etc