Fussy fussy fussy!
Holden engines do suffer overheating particularly off road, most likely because of the poor pull of the fan and the small volume of oil in the sump. That original pump would not help one bit.
If you're going to do a bit of off road in your Holden powered Landy you may want to consider a few things.
Oil starvation. A lot of Holden sumps have the bulge at the front or the rear of the engine. This causes oil starvation on steel inclines for front bulges, for rear bulges the starvation happens on steep decents. The best sump is one off an HT model with a centre bulge. make sure you get the correct oil pickup at the same time.
Air flow If using one of the steel 4 bladed fans, consider replacing it with a later multi bladed plastic fans particularly one with the viscous coupling. Otherwise fit a thermostatic controlled pusher electric fan on the front of the radiator.
Oil volume.
Once oil is hot it both breaks down not protecting the engine as well and takes a lot of cooling to get the temp back down. You can improve this by adding oil volume.
Enlarged sump, some people weld a bigger buldge in the sump to add several litres of oil.
Oil cooler, fitting a sandwich plate between the oil pump and spin on filter will allow you to fit an external oil cooler, this both adds volume and cools the oil. Many sandwich plates have a bi-metal bypass valve which allows the oil to bypass the cooler when the oil temp is low and opens when the temp rises.
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