.???

Rube Goldburg? The 360 l have is the LA design. I'd have to find a 5.9. But won't if it's not worth the trouble.
To run LA heads on a Mag block you've gotta find your own way of getting oil to the top end. Drilling into galleys, running lines through valve covers, hoping you guessed right on hole size/tubing diameter, ect. Yup Rube Goldberg in my book.