my 1982 5.2 would have come with a 5:1 system, that being a double block on the boom and a double block just above the the ratchet block on the traveller

previous owner replaced the double on the boom with a triple and put a loop of sheet to tie-off on to the lower block to make it 6:1

i found that hard work and moved the triple on the boom down to replace the old double on the traveller and put an old triple with becket on the boom so now it's 7:1

so you've got a variety of options if you choose to modify an old/cheap 5:1 set

you could also add another hanger to the boom, the 5.2 originally came with 2, and use that to double? up an older 5:1 system. attached is a pic of my current system, a pic of a double hanger system and the oem 5.2 double hanger in 1975