Cool, thanks guys. One less thing to worry about!
Currently scraping off as much oily crud from underneath the engine prior to refitting everything- it’ll save leaving an oil slick the size of Exxon Valdez. Once the car is running again I can then steam clean everything to see if there are any new leaks. I think one major leak was from the left drive flange seal (I’m checking gearbox oil level tomorrow), and I think another is from the dipstick hole - the oil temp sensor dipstick isn’t a tight fit and I think some oil was blowing out of there. I know I need to replace the pushrod tubes at some point but for now I need to get everything running before I take the car to my mechanic to move the oil cooler rad and sort the tubes.
The weather is finally getting above freezing tomorrow, so I will start to refit everything before cutting out the aluminium tinware. Fingers crossed by next weekend when it gets dry I’ll have the car running, although there are still a lot of ifs and buts to get through first.