A few questions

3Qt. pan? Stock is 4qt.

What are the numbers on the side of the block. A Magnum block will have beefy lifter boss'es and no oil feed hole at the deck. Late model "LA" blocks have the oil hole in the deck and beefy lifter bosses. Older "LA" blocks do not have a beefy lifter boss.



Which oil pan pettyblue?
Mildoon oil pan part #30940.

If I were you,I,d find a reliable engine builder in your area to get some ideas before spending on unwanted parts.JMO