welcome! Good to see someone else here with some classic metal!
As for lowering, it all depends on your spanner handling ability and thickness of your wallet.
Make sure that you dont go any lower than legally allowed, or you'll be nabbed straight away, especially in a car like that!
You could put lowering blocks in the rear, and new lowered spring in the front and new shockies all round. This would give you a nice low car and decent handling. If youve got the money to spend on the rear, then go for getting your springs reset, and an extra leaf in there too! This way you dont need lowereing blocks.:s6: