1 pc oil pan gasket?

does the 1 piece magnum oil pan gasket work on la oil pans?
I have developed a major oil leak and fix it once, i am not positive where it started but i can see a drip on the seal between oil pan and trans. my trans is covered in motor oil as well as exhaust cross over. oil filter is dry. but the side of the block near filter is oily.
It is a rebuilt motor with original acc. and tins. I think the tins are all warped badly and leaking, as i can see small leaks everywhere on the motor.

does anybody know of a gasket kit with high quallity gaskets?