Hi ya and welcome. If it was me, before I went spending big $ on paras, I would make sure the front springs are on the correct side as they are handed. Has the same effect as sagging but you probably already know that. If they are OE, the number part number is stamped on them. To my knowledge the front rhs should be 265627, and lhs 264563. Someone shall correct me if I'm wrong. Can't understand my own scribble after all this time.
We have always found OE springs to ride alright if kept in good condition. Some people sware by using a product called Rocol switch plate spray between the leaves.
IMHO, people have this mispreconception that all older L/Rs ride like crap. If the springs kept in good nick they don't. Trouble is you don't too often find an old banger with good suspension, and everyone assumes they are all like that.
Enjoy your truck, it looks great,
cheers
Evelyn

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REMLR No 257
1966 FFT 114-087
1968 GS 171-953
1970 GS 178-313
1975 swb resto
1975 perkins 4128 donor
1973 swb
1972 lwb abused work truck
1978 ex mil 109 wreck 28-877
1982 stage1 diesel stn wgn
1985 110 V8 stn wgn
it's all good fun while they run!: