72 318 Scamp. Low oil pressure 1 minute after startup.

The car as it sits isn't bad. It dosen't have rust and is complete... except for the grill which I am looking for.

This is my wife's baby muscle car. My brother in law has three 69 dodge Darts. One with a 408 stroker, numbers matching 340 car and a work in progress.

We want a driver that looks decent, is reliable and has a little rumble to it.
I am wondering if with the issues that this engine has if I would be better off going through the brother in laws 360. He said he would give it to me along with a set of Hooker headers. I just have to pick it up.
If we go with the 360 are there things to change to install it?

Sorry for the dumb questions. I have had one Dodge before and I really liked it. Been a backyard mechanic for a long time but my Mopar experience is limited.

I do know that on any engine more cubic inches generally means more power. Without being radical.