Adding capacity without new pan?

Good day to all. I hope everyone has had a good start to their New Year.

I have a project death trap I've been working on. It is a SBC powered Subaru Forester. It is now just a rwd vehicle. (I'm sure I could of kept the awd but that wouldn't be any fun) . Mind you I have done due diligence and stitch welded the ENTIRE car. Inside and out top too bottom. I have added subframe connections as well as strut tower bracing front and rear with firewall and rear floor bracing. A main hoop and 4 down bars so far. It's backed by a WC-T5 manual transmission with 4:44:1 gears outback. Why? I as well am asking myself the same thing. Mostly because the other half loves her Subaru's and has a few of them.

To start with, I am kinda known in my area for putting v8's where no engineer intended to be.

Here is my dilemma, I have reworked the original K member to the limits of what it does for strength in the chassis. I as well have built my own pan (basically cut up a couple pans and bent some sheet metal) that doesn't leak amazing enough. Unfortunately I did some bad math or didn't measure twice cut once. I only have capacity for 3 quarts. Now my brother in law is the type that says 3 outta 4 ain't bad but I disagree in this scenario.

My Question ⁉️
If I just add a oil to air oil cooler I can gain that quart back ? Or even up the cooler capacity and gain maybe 2 quarts? Is this rational thinking?
 

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SOUNDS LIKE AN INTERESTING PROJECT!
posting a few pictures might be helpful?
NOW AS TO oil CAPACITY ,
having only 3 quarts in a v8 is almost sure to cause bearing damage and rotating assembly lubrication issues
there's several routes you can go,
most have potential limitations so Id go several routes, to insure the engine durability improved a great deal
first Id install a longer high capacity oil filter if there's clearance, failure to get a 4.5-6 quart capacity will more than likely result in lower engine durability.
Id suggest you install an oil accumulator, as it insures oil volume and pressure remains reasonably consistent.
and if you have the room and cash adding an oil cooler would both help keep oil temps much more consistent and well within the intended temp ranges.

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make sure your oil pump pick-up is correctly mounted so the clearance with the oil pan is in the 3/8"-1/2" range

Id add a 3 quart accumulator if there's room, and a larger oil filter






 
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Here is a few shots of the process I went through to but of my oil pan
 

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