few magnum questions before swap.

Will my converter on my la 360 work or not and how to tell. Also if I wanna keep serpentine setup how do I do so , like what alternator to use . Also what oil is there for this setup not sure if it's the same for magnum and la pan. Part numbers if u got them thanks. One more question how big of cam will the stock heads and Springs take. I got a low mileage engine and was just gonna swap it in without taking heads off

Regarding the converter, which Magnum Engine and trans are you using? the 5.2 are neutral balance and the 5.9 Magnum uses a weighted flexplate and a neutral-balanced converter.

The serp belt system on the Magnum will work just fine. If you wanted to change to a V belt and make it look more like an LA, you would need the LA timing cover, water pump and V belt pulley.

Use an LA car style oil pan because the Magnums are truck style and don't fit.
Example -

http://magnummopar.com/kevko-5-2-5-9-magnum-oil-pan/

The cam, if its a 5.2 than the stock cam is almost maxed out, the 5.9 can use the 5.2 cam or a similar regrind.
example -

http://magnummopar.com/camshaft-mil...9l-price-includes-refundable-100-core-charge/