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Andy, the 7r will be lighter than any aluminum case. the aluminum will be heavier and stronger. I think the 7R case from the 2.7 already have piston squirters(nit sure about the 2.4 7R). The early case would need this mod done as well as the layshaft bearing mod(I think). The 7R may need shuffle pins for high rpm stability.
Either case is fine, both have their merits.
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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