i got and Oldsmobile engine with trans but i cant decipher what type of engine please help.

4790 6M50.01 G on top of engine behind water pump
and
3F90085?? Cant tell last two, this is on side of block under head please help


1st part number front of block

2nd part of cast on top front of engine looks like there is a g at the end


i

 

Everything is leading to it being a 307 Olds engine

 

The "GM5.0L" is all you need to know. Do the math. 5.0 liters is a 307. I can't clearly make out the VIN derivative stamp, but if that's a "3F9xxxxxx" then the "F" indicates the 1985 model year and the "9" would be Oshawa assembly plant. Which heads are on the motor?