A bit of an update, hope it doesn't sound like waffling.
I got the bolt holding the pulleys off quite easily with the rattle gun. Needed a wheel puller to get the actual pulleys off after the bolt came off.Put them back on using a torque wrench at 100ft/lb and some loctite as suggested.
The engine is out of a 280zx. I bolted the mechanical fuel pump up to it and turned it over. Nothing..... Fuel isn't coming through the pump. Took the pump off and manually pumped it, it is working fine. Lifted the rocker cover, there is no cam for the fuel pump as the 280zx uses an electric fuel pump. I'll have to grab a cam tomorrow. Assuming they are a straight forward bolt on. Hopefully thats the last thing to sort out and the Z should be mobile again. (fingers crossed)