In situations like this, I remove the hoses and nipples and install plugs in the engine. IMHO, a "loop" looks out of place, whereas no hoses isn't as noticeable and those old hoses aren't going to like being bent in a 180. Then there is the fact that one is 3/4 and the other 5/8. The 5/8 probably isn't going to stretch over the 3/4 nipple without cracking and the 3/4 will leak when you attempt to clamp it down on the 5/8 nipple.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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