How would 2 of these do in the back?

[1-12-t1 10+ year member]

New Northstar NSB 75 Silver Battery Made in The U s A | eBay

Ive got a yellow top up front, would the combination be enough for 3krms on a 145alt amp?

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[T3mpest 10+ year member]

3k on a stock alt is asking a bit much regardless od the battery bank.. at some point the alt can only charge the batteries so easiky regardless od their number.. is be looking into a new bigger alt and only one more battery first