Would a ratchet block work well with a jib furling line and would it work well for reefing the jib?

yes and no. I have one to lead my furler line back to the cockpit, but the line then goes to a cam cleat to secure it. see this link in Amazon https://www.amazon.com/GANGUOLA-Bearing-Aluminum-Sailing-Sailboat/dp/B07FZMLTG7/ref=asc_df_B07FZMLTG7?tag=bingshoppinga-20&linkCode=df0&hvadid=80676718050797&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4584276305056643&th=1

would this be a good fit for the vanguard-laserperformance zuma?

It depends on whether you use the 40mm or 57 mm ratchet block. The 40mm would be better for a Zuma. I suggest that you get a spring to keep the ratchet pointed up, otherwise it will flop around. I think Harken sells them by the pair.

What is the largest size rope it can used

Max. Line Diameter: 3/8" (10 mm)

What size line will this block handle?

Max. Line Diameter: 3/8" (10 mm)

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Item Package Dimensions L x W x H	2.4 x 1.5 x 0.5 inches
Package Weight	0.02 Pounds
Item Weight	0.3 Ounces
Brand Name	HARKEN
Warranty Description	Warranty
Model Name	HARKEN Carbo Air Block \| Premium Sailing and Sailboat Equipment
Color	No Color
Material	plastic
Suggested Users	unisex-adult
Number of Items	1
Manufacturer	HARKEN
Part Number	2655
Style	Single, Swivel
Included Components	HARKEN Carbo Air Block \| Premium Sailing and Sailboat Equipment
Size	40 mm Fiddle Carbo

HARKEN Carbo Air Block | Premium Sailing and Sailboat Equipment

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