Yet another v8 swap

[dulcimerbob]

Found this

The 1977 F150 oil pan looks more likely to fit than the 1990 version.

1977:

1990:

Is this a stock pan ?

 

[LILCBRA]

Found this

Is this a stock pan ?

It looks a lot like one. If you have it in your possession I'd say look at the bottom of the sump and see if you can confirm the part number.