My 86 C20 5.7L is leaking oil BIG Time.

[1970pelle]

I'm using 3 qts a week depending on how much I drive the truck. I'm trying to keep it at a minimum till spring break. I won't need the truck while my boys are out of school. And will have some help also. I'm leaking out the rear main seal area, it appears. The flex plate and torque converter are cover with oil. And I have a river of oil running down from the back of the right side cylinder head. So head gaskets will need replaced. And I'm blowing a cloud of blue smoke at start up after setting for awhile. Valve stem oil seals.

My thousand dollar question is my truck is a 1986 5.7 with perimeter bolt valve covers. Do I have a two piece rear main seal or a one piece ? Is there a way to find out before removing the oil pan. I don't want to waste time dropping the pan to find out I have a one piece seal. Then turn around and have to pull the engine. I would much rather pull the engine. And do a engine bay cleaning and repaint.

With the part numbers on the right side deck of the block give me the info needed ?

Thanks Ken